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Problems in the summer vacation homework of eighth grade mathematics
a3 - b3 = (a-b)*(a？ + ab + b？ )

Note a3 b3 represents the cubic of a and the cubic of b, respectively.

Simplify the problem, separate X3-8 from X3-27, and then cut the point. The end result is

-4(X？ +3X+9)/ X？ +2X+4

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