(1+1/3)x=28 (1-2/7)x=40 x-2/5x=36 x+4/7x=55用解方程,

问题描述:

(1+1/3)x=28 (1-2/7)x=40 x-2/5x=36 x+4/7x=55用解方程,

(1+1/3)x=28
x=28*3/4=21
(1-2/7)x=40
x=40*7/5=56
x-2/5x=36
x=36*5/3=60
x+4/7x=55
x=55*7/11=35