解方程组6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
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
一求方程组{6(x-y)-7(x+y)=21,2(x-y)-5(x+y)=-1的解二{2x-y-=-4,4x-5y=-2
要求 解方程组:{(X-1)(Y+1)=(X+1)(Y+1){X(2+Y)-6=Y(X-4)
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)
解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4
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
解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2()
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12