(a+b)^3

=(a+b)^2×（a+b）

=(a^2+2ab+b^2)(a+b）

=a^3+2a^2b+ab^2+a^2b+2ab^2+b^3.

=(a+b)^2×（a+b）

=(a^2+2ab+b^2)(a+b）

=a^3+2a^2b+ab^2+a^2b+2ab^2+b^3.

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