x^2+()+16=() ( 3x)^2-()+4y^2=()^2 坐等
(2x-3y)^2-(y+3y)(3x-y);(3x+2y)(2x+3y)-(x-3y)(3x+4y) 坐等!
求下列不等式解集 (1)|2x-1|>3 (2)x的平方-5x+4小于或等于0 坐等!
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
已知x/2=y/3=z/4,求下列各式 (1)(x+y+z)/x (2)(x-y+2x/(x-y-2z)
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
先化简,再求值:(x+y)(2x-y)-(x+2y)(x-2y),其中x=3,y=4.