2007/2008×2007和2006/2007×2008的简便算法!/=分数线!别理解错咯~
问题描述:
2007/2008×2007和2006/2007×2008的简便算法!
/=分数线!别理解错咯~
答
2007/2008×2007
=(1-1/2008)×2007
=2007-2007/2008
=2006又1/2008
2006/2007×2008
=2006/2007×(2007+1)
=2006+2006/2007
=2006又2006/2007