简便计算：78×79分之78 2008×2007分之200
问题描述：
简便计算：78×79分之78 2008×2007分之200
答
78×79分之78
=（79-1）×78/79
=79×78/79-78/79
=78-78/79
=78又1/79
2008×2007分之200
=（2007+1）×200/2007
=200+200/2007
=200又200/2007
答
78×79分之78=(79-1)×78/79=79×78/79-78/79=78-78/79=77又1/79.
2008×2007分之200=（2007+1）×200/2007
=2007×200/2007+200/2007=200+200/2007=200又200/2007.