问题 解答题
计算下列各题,能简便的请用简便方法
(1)1880×201.1-187.9×2011
(2)
2
5
×5÷
2
5
×5

(3)
8
9
×[
3
4
-(
7
16
-25%)]

(4)7.2×61
3
10
+73.8×2
4
5
答案

(1)1880×201.1-187.9×2011,

=188×2011-187.9×2011,

=(188-187.9)×2011,

=0.1×2011,

=201.1;

(2)

2
5
×5÷
2
5
×5,

=

2
5
÷
2
5
×5×5,

=1×5×5,

=25;

(3)

8
9
×[
3
4
-(
7
16
-25%)],

=

8
9
×[
3
4
-(
7
16
-
1
4
)],

=

8
9
×[
3
4
-
3
16
],

=

8
9
×
9
16

=

1
2

(4)7.2×61

3
10
+73.8×2
4
5

=7.2×61.3+73.8×2.8,

=441.36+206.64,

=648.

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