Question

0.25✘8.6+0.25✘31.4怎么用简便方法计算？

Answer 1

0.25×8×0.4×1.25 =（1.25×8）察碰×（0.25×0.4）=10×0.1 =1 ②遇25想败搜谈4 0.25×4.7×8 =（0.25×4）×（2×4.7）漏碰=1×9.4 =9.4

Answer 2

0.25×8.6+0.25×31.4
=0.25×(8.6+31.4)
=0.25×40
=10