化简:(1)(x+2)2-(2x)2;(2)(2a+3b)2-4a(a+3b+1).
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化简:
(1)(x+2)2-(2x)2;
(2)(2a+3b)2-4a(a+3b+1).
(1)(x+2)2-(2x)2;
(2)(2a+3b)2-4a(a+3b+1).
![化简:(1)(x+2)2-(2x)2;(2)(2a+3b)2-4a(a+3b+1).](/uploads/image/z/19022995-19-5.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%88x%2B2%EF%BC%892-%EF%BC%882x%EF%BC%892%EF%BC%9B%EF%BC%882%EF%BC%89%EF%BC%882a%2B3b%EF%BC%892-4a%EF%BC%88a%2B3b%2B1%EF%BC%89%EF%BC%8E)
(1)(x+2)2-(2x)2,
=x2+4x+4-4x2,
=-3x2+4x+4;
(2)(2a+3b)2-4a(a+3b+1),
=4a2+12ab+9b2-4a2-12ab-4a,
=9b2-4a.
=x2+4x+4-4x2,
=-3x2+4x+4;
(2)(2a+3b)2-4a(a+3b+1),
=4a2+12ab+9b2-4a2-12ab-4a,
=9b2-4a.
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