Ответы на вопрос:
(4^2+1)^2=(16+1)^2=17^2=289, (8^3+7^3)/(8^2-7^2)=(512+343)/(64-49)=855/15=57, (7y-3y)/8=17, 4y/8=17, y/2=17, y=34
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