题目内容

用你喜欢的方法计算
(1)4.86×〔1÷(2.1-2.09)〕
(2)
1
5
÷
6
25
-
2
7
×
7
32

(3)2.5×(1.9+1.9+1.9+1.9)
(4)87.5×0.25+75×87.5%
(1)4.86×〔1÷(2.1-2.09)〕,
=4.86×〔1÷0.01〕,
=4.86×100,
=486;

(2)
1
5
÷
6
25
-
2
7
×
7
32

=
1
5
×
25
6
-
2
7
×
7
32

=
5
6
-
1
16

=
37
48


(3)2.5×(1.9+1.9+1.9+1.9),
=2.5×1.9×4,
=2.5×4×1.9,
=10×1.9,
=19;

(4)87.5×0.25+75×87.5%,
=0.875×25+75×0.875,
=(25+75)×0.875,
=100×0.875,
=87.5.
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