题目内容

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%.
(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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