4/x=0.2/1.

问题描述:

4/x=0.2/1.

X=4*1.5/0.2
X=30

4/x=0.2/1.5
4x1.5=0.2x
6=0.2x
X=30

4×1.5=0.2X
6=0.2X
X=30