解二元一次方程:x+y/2+x-y/3=6 4(x+y)-5(x-y)=2
问题描述:
解二元一次方程:x+y/2+x-y/3=6 4(x+y)-5(x-y)=2
答
x+y/2+x-y/3=6 两边都乘以6
3x+3y+2x-2y=36
5x-y=36
4(x+y)-5(x-y)=2
4x+4y-5x+5y=2
9y-x=2
x-9y=-2