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

问题描述:

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

你几年级啊

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