9x^3y^3-21x^3y^2+12x^2y^2因式分解
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(x-3y)(-3y-x)-2(x-3y)^2要过程
9x^3y^3-21x^3y^2+12x^2y^2因式分解
4X^2-12XY+9Y^2-2X+3Y-6化简!
已知x^2y等于3,求2xy(x^5y^2-3x^3y-4x)
x(x-y)2-(y-x)3
[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
【就一部不懂】如果x、y∈R,且x≠y,比较(x2+y2)2与xy(x+y)2大小作差法 (x2+y2)2-xy(x+y)2 =x^4+y^4+2x^2y^2-x^3y-2x^2y^2-xy^3 =(x-y)(x^3-y^3) =(x-y)^2[(x+y/2)^2+3y^2/4] ∵x≠y (x-y)^2>0,(x+y/2)^2+3y
3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=?
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
计算:x+2y/x-y+2x/y-x-3y/x-y
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
[12(x+y)^3+3(x+y)(x-y)^2]÷6(x+y)
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
12(x+y)^3(y-x)/【4(x+y)^2(x-y)】