Question

0.25X7+0.25X5-2.5X0.2怎么简便算?

Answer 1

这道式子可以将0.25统一提出来，并且加括号，所以可以简化为0.25×（7+5-0.2），所以就等于0.25×11.8=2.95，所以最后的结果就等于2.95。

Answer 2

先将算式等式写出来，
2.5X0.2=0.25X2
0.25X7+0.25X5—2.5X0.2
=0.25X7+0.25X5—0.25X2
=0.25X（7+5—2）
=0.25X10
=2.5

Answer 3

简便计算0.25×7+0.25×5-2.5×0.2=0.25×7+0.25×5-0.25×10×0.2=0.25×（7+5-2）=0.25×10=2.5。

Answer 4

0.25×7+0.25×5-2.5×0.2
＝0.25×7+0.25×5-0.25×2
＝0.25×（7+5-2）
＝0.25×10
＝2.5

Answer 5

=0.25×7+0.25×5-0.25×2
=（7+5-2）×0.25
=10×0.25
=2.5