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(x+2)(x+3)(x-1)ってどうやって計算しますか?

Answers

(x+2)(x+3)(x-1)
=(x+2)(x^2+2x-3)
=(x+2)(x(x+2)-3)
=x(x+2)^2-3(x+2)
=x(x^2+4x+4)-3x-6
=x^3+4x^2+x-6

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