(4a-b²)x(-2b)

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(4a-b²)x(-2b)(4a-b²)x(-2b)(4a-b²)x(-2b)是整合吗?=-8ab+2b³=2b³-8ab2b(b²-4a)

(4a-b²)x(-2b)
(4a-b²)x(-2b)

(4a-b²)x(-2b)
是整合吗?
=-8ab+2b³
=2b³ -8ab
2b(b²-4a)

原式=-8ab+2b³