题目内容
脱式计算(能简算的要简算)
[1-(
+
)]÷
;
×58+
×42.
[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算加法,再算减法,最后算除法;
(2)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算.
解答:
解:(1)[1-(
+
)]÷
=[1-
]÷
=
÷
=
;
(2)
×58+
×42
=
×(58+42)
=
×100
=
.
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 2 |
(2)
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 25 |
| 2 |
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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