已知(2013—a)(2011—a)=2012求(2013—a)的二次方+(2011—a)的二次方
已知(2013—a)(2011—a)=2012求(2013—a)的二次方+(2011—a)的二次方
数学人气:907 ℃时间:2019-12-14 16:26:12
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已知(2013—a)(2011—a)=201 (2013—a)的二次方+(2011—a)的二次方=(2013—a)的二次方-2(2013—a)(2011—a)+(2011—a)的二次方+2×(2013—a)(2011—a)=(2013—a-2011+a)的二次方+2×(2013—a)(2011—a)=2的二次方+2...
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