解方程组x+y/5+x-y/7=2 3(x+y)+x-y/7=16
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
方程组 x+5y+2=06x-7y=16x=y=
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
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
解方程组:3分之x-y=2分之x+y 2x-5y=7
解二元一次方程组:{2x-5y=7 (x-y)/3=(x+y)/2
方程组3X-5Y=-2 和2X+7Y=40中X和Y的解
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
解方程组:2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16