利用因式分解计算（1）2015²-2013² （2）202²+202×196+98²
人气：405 ℃ 时间：2019-10-14 03:06:05
解答
2015²-2013²
=(2015+2013)(2015-2013)
=4028*2
=8056
202²+202×196+98²
=202^2+2*202*98+98^2
=(202+98)^2
=300^2
=90000
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