64х^2-(х-1)^2 =(8х-(х-1))×(8х+(х-1))) =(8х-х+1)×(8х+х-1)= (7х+1)×(9х-1 )
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64х^2-(х-1)^2 =(8х-(х-1))×(8х+(х-1))) =(8х-х+1)×(8х+х-1)= (7х+1)×(9х-1 )