0.3分之x+1 - 0.7分2x-1=0 x等于多少?

问题描述:

0.3分之x+1 - 0.7分2x-1=0 x等于多少?


(x+1)/0.3-(2x-1)/0.7=0
10(x+1)/3-10(2x-1)/7=0
(x+1)/3-(2x-1)/7=0
两边同乘以21得
7(x+1)-3(2x-1)=0
7x+7-6x+3=0
x+10=0
x=-10