题目内容
| 计算: (1)97×
|
(2)
|
(3)(
|
分析:(1)把97拆成96+1,利用乘法分配律简算;
(2)把除法改为乘法,约分计算即可;
(3)先算加减,再算除法.
(2)把除法改为乘法,约分计算即可;
(3)先算加减,再算除法.
解答:解:(1)97×
=(96+1)×
=96×
+1×
=5
;
(2)
×
÷
=
×
×
=
;
(3)(
+
)÷(1-
)
=
÷
=1.
| 5 |
| 96 |
=(96+1)×
| 5 |
| 96 |
=96×
| 5 |
| 96 |
| 5 |
| 96 |
=5
| 5 |
| 96 |
(2)
| 5 |
| 8 |
| 4 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 8 |
| 4 |
| 7 |
| 7 |
| 5 |
=
| 1 |
| 2 |
(3)(
| 3 |
| 5 |
| 3 |
| 10 |
| 1 |
| 10 |
=
| 9 |
| 10 |
| 9 |
| 10 |
=1.
点评:四则混合运算抓住运算顺序,根据数字与符号特点灵活简算.
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