题目内容
脱式计算(写清解题过程)
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考点:运算定律与简便运算
专题:运算定律及简算
分析:(1)根据乘法分配律简便计算;
(2)将
×0.375+
÷
变形为
×
+
×
,再根据乘法分配律简便计算;
(3)先算小括号里面的加法,再算括号外面的除法.
(2)将
| 7 |
| 8 |
| 3 |
| 8 |
| 8 |
| 9 |
| 7 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
| 9 |
| 8 |
(3)先算小括号里面的加法,再算括号外面的除法.
解答:
解:(1)
×
+
×
=(
+
)×
=1×
=
;
(2)
×0.375+
÷
=
×
+
×
=(
+×
)×
=2×
=
;
(3)
÷(
+
)
=
÷
=
.
| 7 |
| 12 |
| 3 |
| 4 |
| 3 |
| 4 |
| 6 |
| 13 |
=(
| 7 |
| 12 |
| 6 |
| 13 |
| 3 |
| 4 |
=1×
| 3 |
| 4 |
=
| 3 |
| 4 |
(2)
| 7 |
| 8 |
| 3 |
| 8 |
| 8 |
| 9 |
=
| 7 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
| 9 |
| 8 |
=(
| 7 |
| 8 |
| 9 |
| 8 |
| 3 |
| 8 |
=2×
| 3 |
| 8 |
=
| 3 |
| 4 |
(3)
| 1 |
| 12 |
| 1 |
| 24 |
| 1 |
| 36 |
=
| 1 |
| 12 |
| 5 |
| 72 |
=
| 6 |
| 5 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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