(a^2-9y^2)-(a+3y)
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(a^2-9y^2)-(a+3y)
(a^2-9y^2)-(a+3y)
(a^2-9y^2)-(a+3y)
(a^2-9y^2)-(a+3y)
=(a-3y)(a+3y)-(a+3y)
=(a-3y-1)(a+3y)
(a^2-9y^2)-(a+3y)
36a^3(x-y)^2/27a(y-x)
5a(x-y)^2+10a(y-x)^3
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2x^2y*A=(-6x^3y^2+9X^2y^3 ,求A=?
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a(x+y)^2+4a-4a(x+y)
解下列关于x,y的方程组y-2x=a 3x+2y=9a
解关于x,y的方程组y-2x=a,3x+2y=9a