问题 解答题
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)[(
8
9
+1
1
3
)×
3
4
-0.75]÷
1
12

(4)85×0.75+15×75%
答案

(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)[(

8
9
+1
1
3
)×
3
4
-0.75]÷
1
12

=[(

8
9
+1
1
3
)×
3
4
-
3
4
1
12

=[(

8
9
+1
1
3
-1)×
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.

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