2/3x=1/6 x=(1/6)/(2/3)=(1/6)*(3/2)=1/4
x/4=3/5 x=(3/5)/(1/4)=(3/5)*4=12/5
2x/3=4/7 x=(4/7)/(2/3)=(4/7)*(3/2)=6/7
3/5-x=1/4 x=3/5-1/4=(12-5)/20=7/20
解:2/3÷x=1/6
x =2/3÷1/6
x =4
解:x÷1/4=3/5
x =1/4×3/5
x=3/20
解:2/3x=4/7
x=4/7÷2/3
x=6/7
解:3/5-x=1/4
x =3/5-1/4
x =7/20