|x-y+1|+(2x-3)^2+0,求1/4x-2y的值

求导数y=3x-x^2 求y',y'/ x=1 y'/x=0 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 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|2x-3y|+|3x-y-1|=0,求x,y的值. 已知X,Y满足|X-Y-1|+（X+Y-3)^2=0求X,Y的值 {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 若(2x-y-1)2+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(x+2y)(x-2y-1)的值若(2x-y-1)²+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(x+2y)(x-2y-1)的值 x>0x,y>0,求x-y+2-y-x-3的值 已知2x-y=0,求分式【1+（3*y*y*y/x*x*x-y*y*y）】/【1+（2y/x-y）】的值注：x*x*x-y*y*y=（x-y）*（x*x+xy+y*y） 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 已知|3x+y-0.5|+(x+2y+1.5)^2=0,求代数式（x-y)(x-2y)-3x(1/3x-y)+(2x+y)(2x-y) 快. y=(X+1)(X+2)(X+3)求导数 y=(2x*x-2x+3)/(x*x-x+1),求值域? 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 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y) |x-y+1|+(2x-3)^2+0,求1/4x-2y的值