题目内容

下面各题怎么简便怎么算.
8
9
×(
7
16
-
1
4
)÷
1
2

78÷[32×(1-
5
8
)+144];
7
15
×
4
5
-
2
15
×
4
5

0.32×2.5×0.125.
(1)
8
9
×(
7
16
-
1
4
)÷
1
2

=
8
9
×
3
16
×2,
=
1
3


(2)78÷[32×(1-
5
8
)+144]
=78÷[32×
3
8
+144],
=78÷[12+144],
=78÷156,
=0.5;

(3)
7
15
×
4
5
-
2
15
×
4
5

=(
7
15
-
2
15
)×
4
5

=
1
3
×
4
5

=
4
15


(4)0.32×2.5×0.125
=0.4×0.8×2.5×0.125,
=(0.4×2.5)×(0.8×0.125),
=1×0.1,
=0.1.
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