解方程组{3x+2y=7 {6x-2y=-1 解方程组{4（x-y）=3（1-y）+2 {2/x+3/y=2解方程组{4（x-y）=3（1-y）+2 {2分之x+3分之y=2

2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组 解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组,x+y/2=3x-2y=10+6x+y/4, 解方程组 y=2x x+y=3 解方程组3分之x-y=2分之 x+y解方程组3分之x-y=2分之 x+y；2x-5y=7 已知方程组{2x+y=6,x-3y=1,不解方程组,求7y(x-3y)²-(3y-x)²的值.已知方程组{2x+y=6,{x-3y=1.不解方程组,求7y(x-3y)²-(3y-x)²的值.已知方程组{2x+y=6，{x-3y=1.不解方程组，求7y(x-3y)²-(3y-x)³ 解方程组x+y/5+x-y/7=2 3(x+y)+x-y/7=16 3/x+y+2/x-y=6,3（x+y)-2(x-y)=28解这个方程组 解方程组;x+y/2=x-y/3=6 4(x+y)-3(x-y)=-20 解方程组6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 解方程组2(x-y)/3-x+y/4=-1 6(x-y)-4(2x-y)=16 解二元一次方程组{x+y/2+x-y/3=6,4(x+y)-2=5(x-y) 解方程组2分之x+y+3分之x-y=6 4(x+y)-5(x-y)=2 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 解方程组⑴(x+y)/2-(x-y)/3=6,⑵3(x+y)=4(x-y)