化简:4a(a+1)-(2a+1)x(2a-1)
问题描述:
化简:4a(a+1)-(2a+1)x(2a-1)
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答
4a(a+1)-(2a+1)x(2a-1)
=4a^2+4a-(4a^2-1) [平方差公式]
=4a+1