问题
解答题
用因式分解进行计算 (1)
|
答案
(1)原式=
=2009 20092-(2009-1)×(2009+1)
=2009 20092-(20092-1)
=2009;2009 20092-20092+1
(2)原式=2.5×(19.7+32.4+47.9)=2.5×100=250.
用因式分解进行计算 (1)
|
(1)原式=
=2009 20092-(2009-1)×(2009+1)
=2009 20092-(20092-1)
=2009;2009 20092-20092+1
(2)原式=2.5×(19.7+32.4+47.9)=2.5×100=250.