2007除以2007又2008分之2007加2009分之1(简便计算)
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2007除以2007又2008分之2007加2009分之1 令2008=a,则2007=a-1,2009=a+1
=(a-1)÷[(a-1)+(a-1)/a]+1/(a+1)
=(a-1)÷[a(a-1)+(a-1)]/a+1/(a+1)
=(a-1)÷[a²-a+a-1]/a+1/(a+1)
=(a-1)÷[a²-1]/a+1/(a+1)
=(a-1)÷[(a-1)(a+1)]/a+1/(a+1)
=(a-1)x[a/(a-1)(a+1)]+1/(a+1)
=a/(a+1)+1/(a+1)
=(a+1)/(a+1)
=1
=(a-1)÷[(a-1)+(a-1)/a]+1/(a+1)
=(a-1)÷[a(a-1)+(a-1)]/a+1/(a+1)
=(a-1)÷[a²-a+a-1]/a+1/(a+1)
=(a-1)÷[a²-1]/a+1/(a+1)
=(a-1)÷[(a-1)(a+1)]/a+1/(a+1)
=(a-1)x[a/(a-1)(a+1)]+1/(a+1)
=a/(a+1)+1/(a+1)
=(a+1)/(a+1)
=1
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=2007÷(2007+2008分之2007)+2009分之1
=2007×2007分之1+2007×2007分之2008+2009分之1
=1+2008+2009分之1
=2009+2009分之1
=2009又2009分之1
求最佳答案!
=2007×2007分之1+2007×2007分之2008+2009分之1
=1+2008+2009分之1
=2009+2009分之1
=2009又2009分之1
求最佳答案!
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2007÷2007(2007/2008)+(1/2009)
=2007÷2007+2007÷(2007/2008)+(1/2009)
=1+2007×(2008/2007)+(1/2009)
=1+1+(1/2009)
=2又2009分之1
=2007÷2007+2007÷(2007/2008)+(1/2009)
=1+2007×(2008/2007)+(1/2009)
=1+1+(1/2009)
=2又2009分之1
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