北大绿卡数学人教版六年级答案(上册)
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北大绿卡数学人教版六年级答案(上册)
比和比的应用(1)(2)(3),就这些了
比和比的应用(1)(2)(3),就这些了
![北大绿卡数学人教版六年级答案(上册)](/uploads/image/z/13442841-9-1.jpg?t=%E5%8C%97%E5%A4%A7%E7%BB%BF%E5%8D%A1%E6%95%B0%E5%AD%A6%E4%BA%BA%E6%95%99%E7%89%88%E5%85%AD%E5%B9%B4%E7%BA%A7%E7%AD%94%E6%A1%88%28%E4%B8%8A%E5%86%8C%EF%BC%89)
1/1987*1988+1/1988*1989+1/1989*1990+1/1990
=1/1987*1988+1/1988*1989+1/1989*1990+1989/1989*1990
(后两个相加)
=1/1987*1988+1/1988*1989+(1+1989)/1989*1990
=1/1987*1988+1/1988*1989+1/1989
=1/1987*1988+1/1988*1989+1988/1988*1989
(后两个相加)
=1/1987*1988+(1+1988)/1988*1989
=1/1987*1988+1/1988
=1/1987*1988+1987/1987*1988
=(1+1987)/1987*1988
=1/1987
=1/1987*1988+1/1988*1989+1/1989*1990+1989/1989*1990
(后两个相加)
=1/1987*1988+1/1988*1989+(1+1989)/1989*1990
=1/1987*1988+1/1988*1989+1/1989
=1/1987*1988+1/1988*1989+1988/1988*1989
(后两个相加)
=1/1987*1988+(1+1988)/1988*1989
=1/1987*1988+1/1988
=1/1987*1988+1987/1987*1988
=(1+1987)/1987*1988
=1/1987