问题 解答题
脱式计算,能简算的要简算.
(1)3.6-2.8+7.4-7.2;
(2)
37
100
×101-
37
100

(3)(5÷
5
6
-
5
6
÷5)÷
5
18

(4)
4
5
×7.7+3.3×0.8-80%.
答案

(1)3.6-2.8+7.4-7.2

=(3.6+7.4)-(2.8+7.2)

=11-10

=1

(2)

37
100
×101-
37
100

=

37
100
×(101-1)

=

37
100
×100

=37

(3)(5÷

5
6
-
5
6
÷5)÷
5
18

=(6-

1
6
)×
18
5

=

35
6
×
18
5

=21

(4)

4
5
×7.7+3.3×0.8-80%

=0.8×(7.7+3.3-1)

=0.8×10

=8

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