若1/x+1/y=2,则 x/(3x+3y)+(y+2xy)/(3x+3y)=
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若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
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()
若y=x(x-1)(x-2)(x-3),则y′(0)=
若(5x+y)(7x+10y)=1/2,则x/y=______;若x+1/x=3,则x^2+1/x^2
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
若变量x,y满足约束条件{x>=-1;y>=x;3x+2y
若x,y满足|x-y+1|+(x+y+3)^2=0则x^2-y^2=
函数,y=3x/(x^2+x+1) ,x
函数y=3x/(x^2+x+1) (x
若x^3+x^2+x+1=0,则y=x^97+x^98+.+x^103
若2x=3y,则(x*x+y*y)/x*x=?
化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x)
x(y-x)分之1,2x-2y分之1若x+x分之1=5,则x²+x²分之1=( ),x-x分之1=( ),x²-5x+3=( )
若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?
若X+6=Y-X-8=2X-3Y-1,则3X-Y=?
若X+6=Y-X-8=2X-3Y-1,则3X-Y=?
若2X+3Y-1=Y-X-8=X+6则2X+Y=