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用简便方法计算下面各题.25+914+514=14+37+34+47=1120+49+920−49=67−(47+114)=1118−58+1718−38=6−27−57=916−(34−316)=27+(35+17)−15=
题目详情
用简便方法计算下面各题.
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▼优质解答
答案和解析
(1)
+
+
,
=
+(
+
),
=
+1,
=1
;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(3)
+
+
-
,
=(
+
)+(
-
),
=1+0,
=1;
(4)
−(
+
),
=
-
-
,
=
-
,
=
;
(5)
-
+
-
,
=(
+
)-(
+
),
=1
-1,
=
;
(6)6−
−
,
=6-(
+
),
=6-1,
=5;
(7)
-(
-
),
=
-
+
,
=
+
-
,
=
-
,
=0;
(8)
+(
+
)−
,
=
+
+
-
,
=(
+
)+(
-
),
=
+
,
=
.
2 |
5 |
9 |
14 |
5 |
14 |
=
2 |
5 |
9 |
14 |
5 |
14 |
=
2 |
5 |
=1
2 |
5 |
(2)
1 |
4 |
3 |
7 |
3 |
4 |
4 |
7 |
=(
1 |
4 |
3 |
4 |
3 |
7 |
4 |
7 |
=1+1,
=2;
(3)
11 |
20 |
4 |
9 |
9 |
20 |
4 |
9 |
=(
11 |
20 |
9 |
20 |
4 |
9 |
4 |
9 |
=1+0,
=1;
(4)
6 |
7 |
4 |
7 |
1 |
14 |
=
6 |
7 |
4 |
7 |
1 |
14 |
=
2 |
7 |
1 |
14 |
=
3 |
14 |
(5)
11 |
18 |
5 |
8 |
17 |
18 |
3 |
8 |
=(
11 |
18 |
17 |
18 |
5 |
8 |
3 |
8 |
=1
5 |
9 |
=
5 |
9 |
(6)6−
2 |
7 |
5 |
7 |
=6-(
2 |
7 |
5 |
7 |
=6-1,
=5;
(7)
9 |
16 |
3 |
4 |
3 |
16 |
=
9 |
16 |
3 |
4 |
3 |
16 |
=
9 |
16 |
3 |
16 |
3 |
4 |
=
3 |
4 |
3 |
4 |
=0;
(8)
2 |
7 |
3 |
5 |
1 |
7 |
1 |
5 |
=
2 |
7 |
3 |
5 |
1 |
7 |
1 |
5 |
=(
2 |
7 |
1 |
7 |
3 |
5 |
1 |
5 |
=
3 |
7 |
2 |
5 |
=
29 |
35 |
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