（x^2-2xy+4y^2)(x+2y)-8x(x+y)(x-y) (64a^3-27b^3)(4a-3b)-(4a+3b)^2 (x^4-x+1）/（x^2+2x-3)
题目
（x^2-2xy+4y^2)(x+2y)-8x(x+y)(x-y) (64a^3-27b^3)(4a-3b)-(4a+3b)^2 (x^4-x+1）/（x^2+2x-3)
（x^2-2xy+4y^2)(x+2y)-8x(x+y)(x-y)
(64a^3-27b^3)(4a-3b)-(4a+3b)^2
(x^4-x+1）/（x^2+2x-3)
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