9分之2×3.6 = 4分之1×3.6 =

问题描述:

9分之2×3.6 = 4分之1×3.6 =

2/9x3.6=2/9x9x0.4=2x0.4=0.8
1/4x3.6=1/4x4x0.9=1x0.9=0.9