问题 解答题
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
答案

(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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