3x-2y=7 2/3(x-1)-4y=8 求x和y
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
3x-2y=7 2/3(x-1)-4y=8 求x和y
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知X和Y满足3X+4Y=2,X-Y-1/7
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知方程组2X+Y=6和X-3Y=1不解方程组,求7Y(X-3Y)^2-(3Y-X)^3
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
9y=3x-(x-1),4(x+y)-(2x+4)=8y
已知2x+2y=-8,4x+y=15求(x-y)^-(3x+2y)^