题目内容

计算下面各题,能简算的要简算.
25×32×125
87×
3
86

5
7
×
7
24
+
1
5
÷
4
5

2
5
×9+
2
5

99×
2
7
+
5
7
×99

(1-
1
100
×80)÷
2
7
(1)25×32×125,
=25×(4×8)×125,
=(25×4)×(125×8),
=100×1000,
=100000;

(2)87×
3
86

=(86+1)×
3
86

=86×
3
86
+1×
3
86

=3+
3
86

=3
3
86


(3)
5
7
×
7
24
+
1
5
÷
4
5

=
5
24
+
1
4

=
11
24


(4)
2
5
×9+
2
5

=
2
5
×(9+1),
=
2
5
×10,
=4;

(5)99×
2
7
+
5
7
×99

=99×(
2
7
+
5
7
),
=99×1,
=99;

(6)(1-
1
100
×80)÷
2
7

=(1-
4
5
)×
7
2

=
1
5
×
7
2

=
7
10
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