｛3x-2y=8 y+4x=7的解

已知（x+y）2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值 已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值 x+y+z=7,2x+3y+4y=20求x,y,z的正整数解 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 4x-(2x+y+16)/2=-6y 2x+3y=7-x-2y4x-(2x+y+16)/2=-6y 2x+3y=7-x-2y求方程组的解 证明：代数式[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]/xy 的值为x,y的值无关 解方程 (x+1)^5/(-1-x)^4=3x+7一定要100%正确阿. 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。 1.解方程组{x+y=7,3x+y=172.{x+y=4,2x-y=53.{3x+2y=5x+2,2（3x+2y)=2x+8 1 已知x+y/y=7/3 求x+y/x-y等于什么2 若x+4/3=y+3/2=z+8/4 且x+y+z=12 求x、y、z的值 3(x+y)-2(x-y)=4; 3(x+y)+2x-2y=8 3(x+y)-2(x-y)=4; 3(x+y)+2x-2y=8 解方程组 方程组4=x+y,8=3x-y求x,y的解 求5x-2y=x-y=4x-3y-2的解 3(x+y)+4(x-y)=36 2(x+y)=-10的解! 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3 解方程组 4(x+y)-(2x-y)=14 ,3(x+y)-2(2x-y)=8