化简求值（a-1)²+2a(a-1)其中a=2

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化简求值（a-1)²+2a(a-1)其中a=2
化简求值（a-1)²+2a(a-1)其中a=2

化简求值（a-1)²+2a(a-1)其中a=2
（a-1)²+2a(a-1)
=(a-1)[(a-1)+2a]
=(a-1)(3a-1)
把a=2代入上式,得到
(a-1)(3a-1)=5