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阅读第(1)小题的计算方法,再用这种方法计算第(2)小题.(1)计算:−556+(−923)+1734+(−312)解:原式=[(−5)+(−56)]+[(−9)+(−23)]+(17+34)+[(−3)+(−12)]=[(−5)+(−9)+17+(−3)]+[(−56)+(−23)+34+(−
题目详情
阅读第(1)小题的计算方法,再用这种方法计算第(2)小题.
(1)计算:−5
+(−9
)+17
+(−3
)
解:原式=[(−5)+(−
)]+[(−9)+(−
)]+(17+
)+[(−3)+(−
)]
=[(−5)+(−9)+17+(−3)]+[(−
)+(−
)+
+(−
)]
=0+(−1
)=−1
上面这种解题方法叫做拆项法.
(2)计算:(−2000
)+(−1999
)+4000
+(−1
).
−5
+(−9
)+17
+(−3
)
解:原式=[(−5)+(−
)]+[(−9)+(−
)]+(17+
)+[(−3)+(−
)]
=[(−5)+(−9)+17+(−3)]+[(−
)+(−
)+
+(−
)]
=0+(−1
)=−1
上面这种解题方法叫做拆项法.
(2)计算:(−2000
)+(−1999
)+4000
+(−1
).
5 5 6 6
2 2 3 3
3 3 4 4
1 1 2 2
[(−5)+(−
)]+[(−9)+(−
)]+(17+
)+[(−3)+(−
)]
=[(−5)+(−9)+17+(−3)]+[(−
)+(−
)+
+(−
)]
=0+(−1
)=−1
上面这种解题方法叫做拆项法.
(2)计算:(−2000
)+(−1999
)+4000
+(−1
).
5 5 6 6
2 2 3 3
3 3 4 4
1 1 2 2
[(−5)+(−9)+17+(−3)]+[(−
)+(−
)+
+(−
)]
=0+(−1
)=−1
上面这种解题方法叫做拆项法.
(2)计算:(−2000
)+(−1999
)+4000
+(−1
).
5 5 6 6
2 2 3 3
3 3 4 4
1 1 2 2
0+(−1
)=−1
上面这种解题方法叫做拆项法.
(2)计算:(−2000
)+(−1999
)+4000
+(−1
).
1 1 4 4
1 1 4 4
(−2000
)+(−1999
)+4000
+(−1
).
5 5 6 6
2 2 3 3
2 2 3 3
1 1 2 2
(1)计算:−5
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
解:原式=[(−5)+(−
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
=[(−5)+(−9)+17+(−3)]+[(−
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
=0+(−1
1 |
4 |
1 |
4 |
上面这种解题方法叫做拆项法.
(2)计算:(−2000
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
−5
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
解:原式=[(−5)+(−
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
=[(−5)+(−9)+17+(−3)]+[(−
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
=0+(−1
1 |
4 |
1 |
4 |
上面这种解题方法叫做拆项法.
(2)计算:(−2000
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
[(−5)+(−
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
=[(−5)+(−9)+17+(−3)]+[(−
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
=0+(−1
1 |
4 |
1 |
4 |
上面这种解题方法叫做拆项法.
(2)计算:(−2000
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
[(−5)+(−9)+17+(−3)]+[(−
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
=0+(−1
1 |
4 |
1 |
4 |
上面这种解题方法叫做拆项法.
(2)计算:(−2000
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
5 |
6 |
2 |
3 |
3 |
4 |
1 |
2 |
0+(−1
1 |
4 |
1 |
4 |
上面这种解题方法叫做拆项法.
(2)计算:(−2000
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
1 |
4 |
1 |
4 |
(−2000
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
▼优质解答
答案和解析
原式=(-2000-
)+(-1999-
)+(4000+
)+(-1-
)
=(-2000-1999+4000-1)+(-
-
)+(-
+
)
=0-1
+0
=-1
.
5 5 56 6 6)+(-1999-
)+(4000+
)+(-1-
)
=(-2000-1999+4000-1)+(-
-
)+(-
+
)
=0-1
+0
=-1
.
2 2 23 3 3)+(4000+
)+(-1-
)
=(-2000-1999+4000-1)+(-
-
)+(-
+
)
=0-1
+0
=-1
.
2 2 23 3 3)+(-1-
)
=(-2000-1999+4000-1)+(-
-
)+(-
+
)
=0-1
+0
=-1
.
1 1 12 2 2)
=(-2000-1999+4000-1)+(-
-
)+(-
+
)
=0-1
+0
=-1
.
5 5 56 6 6-
)+(-
+
)
=0-1
+0
=-1
.
1 1 12 2 2)+(-
+
)
=0-1
+0
=-1
.
2 2 23 3 3+
)
=0-1
+0
=-1
.
2 2 23 3 3)
=0-1
+0
=-1
.
1 1 13 3 3+0
=-1
.
1 1 13 3 3.
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
=(-2000-1999+4000-1)+(-
5 |
6 |
1 |
2 |
2 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
5 |
6 |
2 |
3 |
2 |
3 |
1 |
2 |
=(-2000-1999+4000-1)+(-
5 |
6 |
1 |
2 |
2 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
2 |
3 |
2 |
3 |
1 |
2 |
=(-2000-1999+4000-1)+(-
5 |
6 |
1 |
2 |
2 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
2 |
3 |
1 |
2 |
=(-2000-1999+4000-1)+(-
5 |
6 |
1 |
2 |
2 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
1 |
2 |
=(-2000-1999+4000-1)+(-
5 |
6 |
1 |
2 |
2 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
5 |
6 |
1 |
2 |
2 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
1 |
2 |
2 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
2 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
2 |
3 |
=0-1
1 |
3 |
=-1
1 |
3 |
1 |
3 |
=-1
1 |
3 |
1 |
3 |
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