y=4/45x y=-4/15x+12解一下

2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610（x-y)=3(x+y)+156(x+y)=4(2x-y)+16 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610（x-y)=3(x+y)+156(x+y)=4(2x-y)+16分开的。 解方程组:2(x +y)-3(x-y)=3;4(x+ y)+ 3（x-y）=15 解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12 解方程组{2(x-y)/3 - x+y/4=-1 6(x+y)-41(x-y)=12 解方程组x-4y=-1x-4y=-12x+y=16 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 y=4/45x y=-4/15x+12解一下 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 7x:4y,x:y=( ):( (x-4y)(2x+y)= 5x-4y(y-x)=? 解方程（x+2)²+(x-4)(x+4)=(2x-1)(x+4)已知：x²+xy=12,xy+y²=15,求（x+y)²-(x+y)(x-y)的值 解方程组(1/X+Y)-(1/Y-X)=8/15,(5/X+Y)-5/Y=4 x+x+x+y=60 .x-y=4 解二元一次方程组：3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1