计算:(1)2/1-a-1/a-1 (2)a+2b/a-b+b/b-a-2a/a-b急急急
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计算:(1)2/1-a-1/a-1 (2)a+2b/a-b+b/b-a-2a/a-b急急急
计算:(1)2/1-a-1/a-1 (2)a+2b/a-b+b/b-a-2a/a-b
急急急
计算:(1)2/1-a-1/a-1 (2)a+2b/a-b+b/b-a-2a/a-b急急急
1、2/(1-a)-1/(a-1)
=2/(1-a)+1/(1-a)
=3/(1-a)
2、(a+2b)/(a-b)+b/(b-a)-2a/(a-b)
=(a+2b)/(a-b)-b/(a-b)-2a/(a-b)
=(a+2b-b-2a)/(a-b)
=(b-a)/(a-b)
=-(a-b)/(a-b)
=-1
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(1)2/1-a-1/a-1
=2/(1-a)+1/(1-a)
=3/(1-a)
(2)a+2b/a-b+b/b-a-2a/a-b
=(a+2b)/(a-b)-b/(a-b)-2a/(a-b)
=(a+2b-b-2a)/(a-b)
=(-a+b)/(a-b)
=-1