问题
填空题
用简便方法计算20082-4016×2007+20072的结果是______.
答案
20082-4016×2007+20072,
=20082-2×2008×2007+20072,
=2,
=1.
用简便方法计算20082-4016×2007+20072的结果是______.
20082-4016×2007+20072,
=20082-2×2008×2007+20072,
=2,
=1.