(3a+1)²-(a+6)²= (3a+1-a-6)(3a+1+a+6)= (2a-5)(4a+7)
см. вложение....................
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(3a+1)²-(a+6)²= (3a+1-a-6)(3a+1+a+6)= (2a-5)(4a+7)
см. вложение....................