题目内容
计算下面各题,能简算的要简算.
÷(
+
)
(
-
)×40
×
+40%×
.
| 9 |
| 16 |
| 3 |
| 8 |
| 1 |
| 16 |
(
| 1 |
| 4 |
| 1 |
| 20 |
| 2 |
| 5 |
| 6 |
| 11 |
| 5 |
| 11 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)先算小括号里的加法,再算括号外的除法;
(2)运用乘法的分配律进行简算;
(3)运用乘法的分配律进行简算.
(2)运用乘法的分配律进行简算;
(3)运用乘法的分配律进行简算.
解答:
解:(1)
÷(
+
)
=
÷
=
;
(2)(
-
)×40
=
×40-
×40
=10-2
=8;
(3)
×
+40%×
=
×
+
×
=
×(
+
)
=
×1
=
.
| 9 |
| 16 |
| 3 |
| 8 |
| 1 |
| 16 |
=
| 9 |
| 16 |
| 7 |
| 16 |
=
| 9 |
| 7 |
(2)(
| 1 |
| 4 |
| 1 |
| 20 |
=
| 1 |
| 4 |
| 1 |
| 20 |
=10-2
=8;
(3)
| 2 |
| 5 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 2 |
| 5 |
| 6 |
| 11 |
| 2 |
| 5 |
| 5 |
| 11 |
=
| 2 |
| 5 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
点评:本题考查了分数四则混合运算的顺序及运算定律的灵活运用.
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