△ABC中,AB=1,BC=2,∠B= π3 ,记 AB→ = a→ , BC→ = b→
(Ⅰ)求(2 a→ ﹣3 b→ )•(4 a→ + b→ )的值;
(Ⅱ)求|2 a→ ﹣ b→ |的值.
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