(x-y)(2x-2y)的2次方(3x-3y)的3次方
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(x-y)(2x-2y)的2次方(3x-3y)的3次方
(x-y)(2x-2y)的2次方(3x-3y)的3次方
(x-y)(2x-2y)的2次方(3x-3y)的3次方
原式=(x-y)*2*(x-y)^2*3*(x-y)^3
=6(x-y)^6
=6(x^6-6x^5+15x^4-20x^3+15x^2-6x+1)
=6x^6-36x^5+90x^4-120x^3+90x^2-36x+6
太难了、
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