1）x÷14/15=1/7 x=(1/7)*(14/15)=14/(7*15)=2/15 2)(1-5/8)x=10 (8/8-5/8)x=10 (3/8)x=10 x=10/(3/8)=10*8/3=80/3 3）1/5+4x=4/5 4x=4/5-1/5 4x=3/5 x=(3/5)/4=3/20
