题目内容
下面各题,怎样简便就怎样算.
+
×
;
×
+
×
.
| 2 |
| 3 |
| 4 |
| 15 |
| 5 |
| 8 |
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 6 |
| 1 |
| 8 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)先算乘法,再算加法;
(2)运用乘法分配律简算.
(2)运用乘法分配律简算.
解答:
解:(1)
+
×
=
+
=
;
(2)
×
+
×
=
×(
+
)
=
×1
=
.
| 2 |
| 3 |
| 4 |
| 15 |
| 5 |
| 8 |
=
| 2 |
| 3 |
| 1 |
| 6 |
=
| 5 |
| 6 |
(2)
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 6 |
| 1 |
| 8 |
=
| 5 |
| 6 |
| 7 |
| 8 |
| 1 |
| 8 |
=
| 5 |
| 6 |
=
| 5 |
| 6 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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