Question

0.25x0.25+0.5x0.72简便计算？

Answer 1

让我来试试哈！
0.25×0.25+0.5×0.72
=0.25×0.25+0.25×2×0.72
=0.25×0.25+0.25×1.44
=0.25×（0.25+1.44）
=0.25×1.69
=0.4225
这道题应该没有简便算法了！我只懂这样了！唔好意思啦

Answer 2

脱式计算，
等于0.25×(0.25+2×0.72)，
等于1/4×1.69，
等于1/4×1.6+1/4×0.08+0.25×0.01，
等于0.4+0.02+0.0025，
等于0.4225。

Answer 3

0.25×0.25+0.5×0.72
=0.25×0.25+0.25×2×0.72
=0.25×（0.25+1.44）
=0.25×1.69
=0.4225

Answer 4

提取公约数0.5得
原式=0.5x(0.25x0.5+0.72)
=0.5x(0.127+0.72)
=0.5x0.845
=0.4225