(4a-b²) (-2b)计算过程?

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(4a-b²) (-2b)计算过程?
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(4a-b²) (-2b)计算过程?
(4a-b²) (-2b)计算过程?

(4a-b²) (-2b)计算过程?

(4a-b²)(-2b
)=-8ab+2b³