计算下列各题,能简便的请用简便方法(1)1880×201.1-187.9×2011(2)25×5÷25×5(3)89×[34?(71

2024-11-23 21:49:58
推荐回答(1个)
回答1:

(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.