Question

用加减法解下列方程7+x-3y/4=2x-y+5/3 10(x-y)-4(1-x)/3=y

Answer 1

7+x-3y/4=2x-y+5/3

同时乘以12化为整数：84+12x-9y=24x-12y+20

12x-3y=64;(a)

10(x-y)-4(1-x)/3=y

同时乘以3化为整数：30（x-y）-4(1-x)=3y

30x-30y-4+4x-3y=0

34x-33y=4;(b)

a式*11-b式:132x-33y-(34x-33y)=704-4

98x=700

x=0.14,y=-20.773~