2) =(2а+5b-2a+3b)/ab = 8b/ab= 8/a
4) =(a-2+a)/(a-1)=2
8) =(3a+6c-6c)/c= 3a/c
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2) =(2а+5b-2a+3b)/ab = 8b/ab= 8/a
4) =(a-2+a)/(a-1)=2
8) =(3a+6c-6c)/c= 3a/c