Question

1又20分之一加2又30分之1加3又42分之1加4又56分之1加5又72分之1加6又90分之1加7又110分之1等于多少

2007+2006×2008/2007×2008－1＋2008＋2007×2009/2008×2009－1 怎么做

Answer 1

解：原式=（1+1/20)+(2+1/30)+(3+1/42)+(4+1/56)+(5+1/72)+(6+1/90)+(7+1/110)
=(1+2+3+4+5+6+7)+(1/20+1/30+1/42+1/56+1/72+1/90+1/110)
=(1+7)*7/2+(1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11)
=28+(1/4-1/11)
=28+7/44
=28又7/44

Answer 2

1又20分之一+2又30分之1+3又42分之1+4又56分之1+5又72分之1+6又90分之1+7又110分之1
=(1+2+3+4+5+6+7)+(1/20+1/30+1/42+1/56+1/72+1/90+1/110)
=28+(1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11)
=28+(1/4-1/11)
=28+7/44
=28又7/44

Answer 3

原式=1+1/20+2+1/30+3+1/42+4+1/56+5+1/72+6+1/90+7+1/110
=(1+2+3+4+5+6+7)+1/4-1/5+1/5-1/6+1/6-1/7++1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11
=28+1/4-1/11
=28又7/44

Answer 4

Answer 5

追问

2007+2006×2008/2007×2008－1＋2008＋2007×2009/2008×2009－1 怎么做

追答

用笔写一写

追问

2007+2006乘以2008 2008+2007乘以2009
————————- +———————— =
2007乘以2008-1 2008乘以2009-1

追答