化简:4a(a+1)-(2a+1)x(2a-1)

问题描述:

化简:4a(a+1)-(2a+1)x(2a-1)
帮帮我解答

4a(a+1)-(2a+1)x(2a-1)
=4a^2+4a-(4a^2-1) [平方差公式]
=4a+1