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HasAnn

Ответ:

((3х+1)(3х-1))/(3х+1)²= ((3х+1)(3х-1))/(3х+1)(3х+1)=(3х-1)/(3х+1)=(3*5/6-1)/(3*5/6+1)=

=(5/2-1)/(5/2+1)= 3/2:7/2=3/2*2/7=3/7

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