Question

1/2x+1/20x=7/20×4/7怎么算?(7/10-1/5)/÷x=1/20怎么算?

Answer 1

1/2x+1/20x=7/20×4/7

(10x+x)/20=4/20

11x=4

x=4/11

(7/10-1/5)/÷x=1/20

(7-2)/10=x*1/20

1/2=x/20

x=10