已知|ab-2|+|a-2|=0,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2006)(b+2006)速度点啊,很急~在线等!还有几个题,谢谢了!1.已知a、b、c为整数,且|a-b|+|c-a|=1.求|c-a|+|a-b|+|b-c|的值。2.化简|3-π|+|π-4|3.式子a/|a|+b/|
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已知|ab-2|+|a-2|=0,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2006)(b+2006)速度点啊,很急~在线等!还有几个题,谢谢了!1.已知a、b、c为整数,且|a-b|+|c-a|=1.求|c-a|+|a-b|+|b-c|的值。2.化简|3-π|+|π-4|3.式子a/|a|+b/|
已知|ab-2|+|a-2|=0,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2006)(b+2006)
速度点啊,很急~在线等!
还有几个题,谢谢了!
1.已知a、b、c为整数,且|a-b|+|c-a|=1.求|c-a|+|a-b|+|b-c|的值。
2.化简|3-π|+|π-4|
3.式子a/|a|+b/|b|+ab/|ab|的所有可能的值
4.化简|1/2004-1/2003|+|1/2003-1/2002|+|1/2002-1/2001|+|1/2001-1/2004|
谢谢大家在回答下,我会再追加的!~
已知|ab-2|+|a-2|=0,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2006)(b+2006)速度点啊,很急~在线等!还有几个题,谢谢了!1.已知a、b、c为整数,且|a-b|+|c-a|=1.求|c-a|+|a-b|+|b-c|的值。2.化简|3-π|+|π-4|3.式子a/|a|+b/|
非负数之和为0则每个都为0.
所以ab-2=0,a-2=0,解得a=2,b=1;
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2006)(b+2006)
=1/(2*1)+1/(3*2)+……+1/(2008*2007)
=1/1-1/2+1/2-1/3+……+1/2007-1/2008
=1/1-1/2008
=2007/2008.
|ab-2|+|a-2|=0
ab-2=0 ->ab=2
a-2=0 ->a=2
a=2,b=1
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2006)(b+2006)
=1/(1*2)+1/(2*3)+1/(3*4)+……+1/(2007*2008)
=1-1/2+1/2-1/3+1/3-1/4+……+1/2007-1/2008
=1-1/2008
=2007/2008
因为|ab-2|+|a-2|=0且|ab-2|不小于0,|a-2|不小于0
所以|ab-2|等于0,|a-2|等于0
ab-2等于0,a-2等于0
a=2
把a=2带入ab-2=0得,
2b-2=0
b=1
后面的就不会了,自己去想吧……
SORRY~~