y=x^2-3x+2/x^2-x+1,判别式法
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函数,y=3x/(x^2+x+1) ,x
函数y=3x/(x^2+x+1) (x
化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x)
3^x+2x=y,x
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
y=(2x*x-2x+3)/(x*x-x+1),求值域?
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4)
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简:{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x
x(x-y)2-(y-x)3
计算:1-2x+x^2/x-x^3*xy+x^2y/x-x^2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)