Question

解二元一次方程：x+y/2+x-y/3=6 4(x+y)-5(x-y)=2

Answer 1

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
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