已知Ia-1I+Iab-2I=0(IA-1I为A-1的绝对值)求1/(ab)+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2000)(b+2000)的值我想对一下看我的是不是对的.我做对了。
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![已知Ia-1I+Iab-2I=0(IA-1I为A-1的绝对值)求1/(ab)+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2000)(b+2000)的值我想对一下看我的是不是对的.我做对了。](/uploads/image/z/1105403-59-3.jpg?t=%E5%B7%B2%E7%9F%A5Ia-1I%2BIab-2I%3D0%28IA-1I%E4%B8%BAA-1%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%EF%BC%89%E6%B1%821%2F%EF%BC%88ab%29%2B1%2F%28a%2B1%29%28b%2B1%29%2B1%2F%28a%2B2%29%28b%2B2%29%2B%E2%80%A6%2B1%2F%28a%2B2000%29%28b%2B2000%29%E7%9A%84%E5%80%BC%E6%88%91%E6%83%B3%E5%AF%B9%E4%B8%80%E4%B8%8B%E7%9C%8B%E6%88%91%E7%9A%84%E6%98%AF%E4%B8%8D%E6%98%AF%E5%AF%B9%E7%9A%84.%E6%88%91%E5%81%9A%E5%AF%B9%E4%BA%86%E3%80%82)
已知Ia-1I+Iab-2I=0(IA-1I为A-1的绝对值)求1/(ab)+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2000)(b+2000)的值我想对一下看我的是不是对的.我做对了。
已知Ia-1I+Iab-2I=0(IA-1I为A-1的绝对值)
求1/(ab)+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2000)(b+2000)的值
我想对一下看我的是不是对的.
我做对了。
已知Ia-1I+Iab-2I=0(IA-1I为A-1的绝对值)求1/(ab)+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2000)(b+2000)的值我想对一下看我的是不是对的.我做对了。
飞天鼠怎么都出第3代了,第1代第2代去哪了?
|a-1|=0,|ab-2|=0
a-1=0,ab-2=0
求得,a=1,b=2
1/(ab)+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2000)(b+2000)
=1/1×2+1/2×3+1/3×4+...+1/2001×2002
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/2001-1/2002)
=1-1/2+1/2-1/3+1/3-1/4+...+1/2001-1/2002
=1-1/2002
=2001/2002
绝对值大于等于0,相加等于0,若有一个大于0,则另一个小于0,不成立
所以两个都等于0
所以a-1=,ab-2=0
a=1,ab=2,b=2/a=2
所以1/(ab)+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2000)(b+2000)
=1/1*2+1/2*3+……+1/2001*2002
=(1/1-1/2)+(1/...
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绝对值大于等于0,相加等于0,若有一个大于0,则另一个小于0,不成立
所以两个都等于0
所以a-1=,ab-2=0
a=1,ab=2,b=2/a=2
所以1/(ab)+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2000)(b+2000)
=1/1*2+1/2*3+……+1/2001*2002
=(1/1-1/2)+(1/2-1/3)+……+(1/2001-1/2002)
=1-/2002
=2001/2002
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