题目内容
用你喜欢的方法计算.
(1)1080-63.58-36.42
(2)7.05×37+64×7.05-7.05
(3)[(
+1
)×
-0.75]÷
(4)85×0.75+15×75%
(1)1080-63.58-36.42
(2)7.05×37+64×7.05-7.05
(3)[(
8 |
9 |
1 |
3 |
3 |
4 |
1 |
12 |
(4)85×0.75+15×75%
分析:(1)根据减法的性质进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
解答:解:(1)1080-63.58-36.42,
=1080-(63.58+36.42),
=1080-100,
=980;
(2)7.05×37+64×7.05-7.05,
=7.05×(37+64-1),
=7.05×100,
=705;
(3)[(
+1
)×
-0.75]÷
,
=[(
+1
)×
-
]÷
,
=[(
+1
-1)×
]÷
,
=
×
÷
,
=
÷
,
=11;
(4)85×0.75+15×75%,
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75.
=1080-(63.58+36.42),
=1080-100,
=980;
(2)7.05×37+64×7.05-7.05,
=7.05×(37+64-1),
=7.05×100,
=705;
(3)[(
8 |
9 |
1 |
3 |
3 |
4 |
1 |
12 |
=[(
8 |
9 |
1 |
3 |
3 |
4 |
3 |
4 |
1 |
12 |
=[(
8 |
9 |
1 |
3 |
3 |
4 |
1 |
12 |
=
11 |
9 |
3 |
4 |
1 |
12 |
=
11 |
12 |
1 |
12 |
=11;
(4)85×0.75+15×75%,
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.

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