9分之X等于0.7分之0.3怎么解比例?
问题描述:
9分之X等于0.7分之0.3怎么解比例?
答
9分之X等于0.7分之0.3
x/9=0.3/0.7
x/9=3/7
x=3/7×9
x=27/7