用因式分解的提取公因式法解决:
①7.6×201.2+4.3×201.2-19×20.12
②2012+2012²-2013²
人气:122 ℃ 时间:2019-12-28 23:44:57
解答
①7.6×201.2+4.3×201.2-19×20.12
=20.12(76+43-19)
=2012
②2012+2012²-2013²
=2012(1+2012)-2013²
=2013×2012-2013²
=2013(2012-2013)
=-2012
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