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奇思妙算(用简便方法计算下面各题)(1)78×56×87-13(2)79÷215+29×511(3)(29×13-29)÷13.
题目详情
奇思妙算(用简便方法计算下面各题)
(1)
×
×
-
(2)
÷2
+
×
(3)(
×13-
)÷
.
×
×
-
(2)
÷2
+
×
(3)(
×13-
)÷
.
7 7 8 8
×
-
(2)
÷2
+
×
(3)(
×13-
)÷
.
5 5 6 6
-
(2)
÷2
+
×
(3)(
×13-
)÷
.
8 8 7 7
(2)
÷2
+
×
(3)(
×13-
)÷
.
1 1 3 3
÷2
+
×
(3)(
×13-
)÷
.
7 7 9 9
+
×
(3)(
×13-
)÷
.
1 1 5 5
×
(3)(
×13-
)÷
.
2 2 9 9
(3)(
×13-
)÷
.
5 5 11 11
×13-
)÷
.
2 2 9 9
)÷
.
2 2 9 9
.
1 1 3 3
(1)
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| 8 |
| 5 |
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| 8 |
| 7 |
| 1 |
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(2)
| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
| 7 |
| 8 |
| 5 |
| 6 |
| 8 |
| 7 |
| 1 |
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(2)
| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
| 7 |
| 8 |
| 5 |
| 6 |
| 8 |
| 7 |
| 1 |
| 3 |
(2)
| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
| 5 |
| 6 |
| 8 |
| 7 |
| 1 |
| 3 |
(2)
| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
| 8 |
| 7 |
| 1 |
| 3 |
(2)
| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
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| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
| 5 |
| 11 |
| 2 |
| 9 |
| 2 |
| 9 |
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| 9 |
| 1 |
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| 2 |
| 9 |
| 1 |
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| 1 |
| 3 |
▼优质解答
答案和解析
(1)78×56×87-13=(78×87)×56-13=1×56-13=56-13=12(2)79÷215+29×511 =79×511+29×511 =(79+29)×511 =1×511 =511 (3))(29×13-29)÷13=(13-1)×29×3=12×...
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