2x^2-7x+7=0 2y^2-7y+8=0x和y旳值?
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7y(x-3y)-2(3y-x)=0 .x=?,y=?
x+2y=2x+y+1=7x-y 求:2x-y?
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
x^2+y^2=15,x+y=7,x>y,求x-y
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
当x+y=2时7(x+y)一(x+y)+(x+y)=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
化简3(x-y)-7(x--y)+2(y-x)
(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
求f(x,y)=x+y+7的最大值,使(x,y)满足x+2y≤10,2x+y≥6,y≥0
{2x+y/3-2y=0 2(2x+y)-5=7y
{x+2y+2=0 {7y-4y=-41 求X和Y
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x+2y+2=0 7x-4y=-41 求x和y
y^2+2y-x=3x^7,x=0时y的导数
已知(x-y)^2+|5x-7y-2|=0,求x,y的值.
已知|5x-y-8|+(7y-x+2)=0则4x+6y