若(m+2010)2=12345,求(m+2000)(m+2020)的值上面那个是(m+2010)的二次方
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若(m+2010)2=12345,求(m+2000)(m+2020)的值上面那个是(m+2010)的二次方
若(m+2010)2=12345,求(m+2000)(m+2020)的值
上面那个是(m+2010)的二次方
若(m+2010)2=12345,求(m+2000)(m+2020)的值上面那个是(m+2010)的二次方
(m+2000)(m+2020)
=[(m+2010)-10][(m+2010)+10]
=(m+2010)²-10²
=12345-100
=12245