｜x-3｜+｜y-4/1｜=0,求3X－4Y的值

x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y² 3x+4y-5=0 x^2+y^2=1求x.y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y (-x+6):(x-y);(4x+y)=3;14:1,求x+y的值. 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 如果X.Y满足X平方+Y平方—4X+1=0求3/X的最大值 Y-X最小值 X平方+Y平方的最大值 求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4) (x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=－2 0 求x,y分可以加. 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 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 已知实数x、y满足|2x-y+1|+3根号3x-2y+4=0,求代数式[(x-y)/(x-2y)]/(x的平方-2y)/[(x的平方-y的平方）/x的已知实数x、y满足|2x-y+1|+3根号3x-2y+4=0,求代数式[(x-y)/(x-2y)]/(x的平方-2y)/[(x的平方-y的平方）/（x的 若|x-1|+|2x+4y|=0,求3x-2y ｜x-3｜+｜y-4/1｜=0,求3X－4Y的值 求导数y=3x-x^2 求y',y'/ x=1 y'/x=0 求值域:y=(x^2+1)/[x(x-4/3)],(x>0) x-2y+3=0 求x^2-(4y+1)x+4y^2+8y