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若将算式1994+12-113+212-313+412-513+…+199212-199313的值化为小数,由小数点后第1个数字是()A.4B.3C.2
题目详情
若将算式 1994+
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1 |
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A.4 | B.3 | C.2 | D.1 |
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A.4 | B.3 | C.2 | D.1 |
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1 |
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1 |
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1 |
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1 |
3 |
1 |
2 |
1 |
3 |
A.4 | B.3 | C.2 | D.1 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
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1 |
3 |
1 |
2 |
1 |
3 |
A.4 | B.3 | C.2 | D.1 |
1 |
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1 |
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1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
A.4 | B.3 | C.2 | D.1 |
1 |
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1 |
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1 |
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3 |
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1 |
3 |
1 |
2 |
1 |
3 |
A.4 | B.3 | C.2 | D.1 |
▼优质解答
答案和解析
1994+
-1
+2
-3
+4
-…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D. 1994+
-1
+2
-3
+4
-…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D. 1994+
-1
+2
-3
+4
-…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D. 1994+
-1
+2
-3
+4
-…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -1
+2
-3
+4
-…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 +2
-3
+4
-…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -3
+4
-…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 +4
-…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -…+1992
-1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -1993
,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 ,
=2
-1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -1
+4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 +4
-3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -3
+…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 +…+1992
-1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -1991
+1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 +1994
-1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -1993
,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 ,
=(2-1)+(
-
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -
)+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 )+(4-3)+(
-
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -
)+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 )+…+(1992-1991)+(
-
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -
)+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 )+(1994-1993)+(
-
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 2 1 1 1 2 2 2 -
),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 3 1 1 1 3 3 3 ),
=(1+
)×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 6 1 1 1 6 6 6 )×(1994÷2),
=
×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
7 6 7 7 7 6 6 6 ×997,
=
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
6979 6 6979 6979 6979 6 6 6
=1163
,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 6 1 1 1 6 6 6 ,
≈1163.167;
小数点后第1个数字是1.
故选:D.
1994+
=2
=(2-1)+(
=(1+
=
=
=1163
≈1163.167; 小数点后第1个数字是1. 故选:D. |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
=2
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
=(2-1)+(
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
2 |
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
3 |
=(1+
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
6 |
=
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
7 |
6 |
=
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
6979 |
6 |
=1163
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
1 |
6 |
≈1163.167;
小数点后第1个数字是1.
故选:D.
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