Question

2008/2008又2009分子2008+2010分子一简便方法

Answer 1

=2008/(2008+2008/2009)+1/2010
=2008/[2008×(1+1/2009)]+1/2010
=1/(2010/2009)+1/2010
=2009/2010+1/2010
=1

Answer 2

=[(-9)*(-2/3)*1/3]³
=2³
=8
a+b=0
a=-b
-b/a=1
所以x1+x2=-b/a=1
=(-1/2)的4次方
=1/16
x的-2次方=1/x²
所以x≠0