Question

0.625×280-0.625×130+0.625×0.1×225-0.375×525的简便计算？

Answer 1

0.625×280-0.625×130
+0.625×0.1×225-0.375×525的简便计算
=0.625×(280-130+0.1×225)-0.375×525
=0.625x147.75-196.875
=92.34375-196.875
=104.53125

Answer 2

21.7-0.625+8.3-0.375简单计算=21.7+8.3-（0.625+0.375）=30-1=29

Answer 3

0.625×280-0.625×130+0.625×0.1×225-0.375×525
=0.625×（280-130+0.1×225）-0.375×525
=0.625×172.5-0.375×525
=1/8×（5×172.5-3×525）
=1/8×（862.5-1575）
=1/8×（-712.5）
=-89.625
说明：
1/8=0.125
2/8=0.25
3/8=0.375
4/8=0.5
5/8-0.625
6/8=0.75
7/8=0.875

Answer 4

可以这样简便计算
原式=0.625×（280-130+0.1×225）-（1-0.625）×525
=0.625×（280-130+22.5+525）-525
=0.625×697.5-525
=0.625×700-0.625×2.5-525
=437.5-1.5625-525
=-89.0625

Answer 5

0.625×280-0.625×130+0.625×0.1×225-0.375×525
=0.625×(280-130+22.5)-0.375×525
=0.625×177.5-0.375×525
=0.375×355-0.375×525
=0.375×(355-525)
=0.375×(-170)
=-63.75