
已知(2009-a)(2007-a)=2008 求(a-2008)的平方的值
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(2009 - a)(2007 - a) = 2008
(2008 - a + 1)(2008 -a - 1) = 2008
(2008 - a)² - 1 = 2008
(2008 - a)² = 2009
(a - 2008)² = 2009
(2008 - a + 1)(2008 -a - 1) = 2008
(2008 - a)² - 1 = 2008
(2008 - a)² = 2009
(a - 2008)² = 2009
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