解方程组 x-2y=0,3x+4y=20

解方程组;x+y/2=x-y/3=6 4(x+y)-3(x-y)=-20 解方程组 x-2y=0,3x+4y=20 解方程组3x+5(x+y)=2 3y-2(x+y)=4 解方程组｛ 3x-4y(x-y)=3 { 2x-3y=1 解方程组,(x+y)^2-3(x+y)=0和x-y=1 解方程组x+y/3=x-y/4 2x+3y=11 解方程组,x+y/2=3x-2y=10+6x+y/4, 先化简再求值; 解方程组 x(x-y)-y(x+y)+2xy 其中x=2 ,y=-22.x[x-x(x-1)],其中x=-2解方程组4x+3y=12x-y=32.y+1=2x 4x-y=2 3.2x+2y=0 2x-y+24=0 解方程组 y=2x x+y=3 解方程组x^2-y^2=x+y 4x^2-y^2+2x-y=0过程 解方程组2(x-y)/3-x+y/4=-1 6(x-y)-4(2x-y)=16 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 解方程组:2(x +y)-3(x-y)=3;4(x+ y)+ 3（x-y）=15 解方程组 4(x+y)-(2x-y)=14 ,3(x+y)-2(2x-y)=8 2元一次方程组 2/x+y+3/x-y=6 4(x+y)-3(x-y)=-20 解二元一次方程组3(x+y)-4(x-y)=4 x+y/2+x-y/6=1 解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1kkkkkkkk 3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组