化简求值:3（a+1)^2-(a+1)(2a-1)其中a=1是化简求值啊!
问题描述：
化简求值:3（a+1)^2-(a+1)(2a-1)其中a=1
是化简求值啊!
答
3（a+1)^2-(a+1)(2a-1)
=(a+1)[3(a+1)-(2a-1)]
=(a+1)(a+4),
=2*5
=10
答
3（a+1)^2-(a+1)(2a-1)
=(a+1)(3a+3-2a+1)
=(a+1)(a+4)
=(1+1)(1+4)
=2*5
=10