解方程组{6x-7y=40,5x-2y=-8的具体过程

解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1 解方程组6/x-7/y=40和2/x-5/y=8 x+y+xy=5 (x^2)y+x(y^2)=6 解方程组 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 解方程组 x+y/5+x-y/2=7 4(x+y)-5(x-y)=2 解方程组x+y/5+x-y/7=2 3(x+y)+x-y/7=16 解方程组x+y/2+x-y/2=7,4(x+y)-5(x-y)=2... 解方程组题目一道(x+y)(x-2y)=-5(x-y)(x+2y)=7 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/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 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:{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 解方程组：3(x+y)+2(x-y)=11,6(x+y)-5(x-y)=13.