Question

化简多项式(a+2b)^2-3a(a-2b)+2(a+b)(a-b)

Answer 1

(a+2b)^2-3a(a-2b)+2(a+b)(a-b)

=a^2+4ab+4b^2-3a^2+6ab+2a^2-2b^2

=10ab+2b^2

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