163×1.8163 163×0.18163
2.7×12.7× (0.8+0.2) 7.3×6.464×0.73
每包的本数/本
10
20
40
包数/包
60
30
15
1.25×80%= = 1﹣0.375= 6÷0.2=
= 2.35+4.7= = 16×0.25=
= =