(100-x)/(80+x)=7:
问题描述:
(100-x)/(80+x)=7:
答
11(100-x)=7(80+x) 1100-11x=560+7x 1100-560=11x+7x 18x=540 x=30
(100-x)/(80+x)=7:
11(100-x)=7(80+x) 1100-11x=560+7x 1100-560=11x+7x 18x=540 x=30