(x-2)2+|y+3|=0则=?
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若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8?(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
已知x^2-6y^2=-xy,x>0,y>0且x不等于y.则(x+3y)/(x-y)的值为_____?
若|x-3|+(y+2)=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若|x-3|+(y+2)²=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0
若y=x(x-1)(x-2)(x-3),则y′(0)=
若x,y互为相反数(y≠0),则2x+5+2y+3x/y=____
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y)=-7}则(X+Y)(X-Y)=
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)
1.(X-Y)/13=Y/7问(x+y)/y=?.2.x/6=y/4=z/3(x.z.y不为0)则(X+3Y)/3Y-2Z=?
lx-y+3l+(x+y)^2=0,则x+3y块
已知|x+y-3|+(x-y)2=0则
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x(x-2y)=y(2y-x) ,则y分之x是多少
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于