题目内容

能简算的用简便方法计算.
2
5
-
2
5
÷2)×
5
3
15
16
-(
7
12
+
1
6
)×
1
2
8
25
×99+
8
25
(1-75%)÷(1+
1
4
204÷
1
91
+204×9.
2.7÷(1-20%-18%)
①(
2
5
-
2
5
÷2)×
5
3

=(
2
5
-
1
5
)×
5
3

=
1
5
×
5
3

=
1
3


15
16
-(
7
12
+
1
6
)×
1
2

=
15
16
-
3
4
×
1
2

=
15
16
-
3
8

=
9
16


8
25
×99+
8
25

=(99+1)×
8
25

=100×
8
25

=32;

④(1-75%)÷(1+
1
4
),
=
1
4
÷
5
4

=
1
5


⑤204÷
1
91
+204×9,
=204×91+204×9,
=(91+9)×204,
=100×204,
=20400;

⑥2.7÷(1-20%-18%),
=2.7÷(1-0.2-0.18),
=2.7÷0.62,
=4
11
31
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