Question

1.x:3=0.75:1/10 2.7:8=x:56 3.x/1：1/3=1/15:1/5

Answer 1

1.x:3=0.75:1/10=0.75:0.1=7.5 =>x=22.5

2.7:8=x:56 =>x=7*56/8=49

3.x/1:1/3=1/15:1/5,将左边上下同时乘以3,右边上下同时乘以15,得到3x=1/3 =>x=1/9