题目内容
脱式计算,能简算的简算
×
+
÷8
10×
-
×
×36.
| 4 |
| 7 |
| 1 |
| 8 |
| 3 |
| 7 |
10×
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 6 |
| 5 |
| 7 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)可将式中的除法算式变为乘法算式后,根据乘法分配律计算.
(2)可根据乘法分配律计算.
(3)可根据乘法交换律计算.
(2)可根据乘法分配律计算.
(3)可根据乘法交换律计算.
解答:
解:(1)
×
+
÷8
=
×
+
×
=(
+
)×
=1×
=
;
(2)10×
-
=(10-1)×
=9×
=4;
(3)
×
×36
=
×36×
=6×
=
| 4 |
| 7 |
| 1 |
| 8 |
| 3 |
| 7 |
=
| 4 |
| 7 |
| 1 |
| 8 |
| 3 |
| 7 |
| 1 |
| 8 |
=(
| 4 |
| 7 |
| 3 |
| 7 |
| 1 |
| 8 |
=1×
| 1 |
| 8 |
=
| 1 |
| 8 |
(2)10×
| 4 |
| 9 |
| 4 |
| 9 |
=(10-1)×
| 4 |
| 9 |
=9×
| 4 |
| 9 |
=4;
(3)
| 1 |
| 6 |
| 5 |
| 7 |
=
| 1 |
| 6 |
| 5 |
| 7 |
=6×
| 5 |
| 7 |
=
| 30 |
| 7 |
点评:在完成脱式计算题目时,要注意计算过程的完整性,中间不要有太大跳跃.
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