题目内容
下面各题,怎样简便就怎样算.
÷7+
×
×
+
÷
.
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
| 1 |
| 2 |
| 2 |
| 5 |
| 9 |
| 10 |
| 9 |
| 20 |
分析:(1)根据乘法分配律进行简算;
(2)先算乘法和除法,再算加法.
(2)先算乘法和除法,再算加法.
解答:解:
(1)
÷7+
×
=
×
+
×
=(
+
)×
=
×
=
;
(2)
×
+
÷
=
+2
=2
.
(1)
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
(2)
| 1 |
| 2 |
| 2 |
| 5 |
| 9 |
| 10 |
| 9 |
| 20 |
=
| 1 |
| 5 |
=2
| 1 |
| 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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