81(x+2y)^2-9(x-3y)^2 因式分解
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81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
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
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
化简y(x+y)+(x+y)(x-y)-x^2
x^3y^2+6x^2y+9x
2X(2X-3Y)-3Y(X+Y)
(-2x y)^2-(3y-x)(-x-3y)