Ответ:
(1/7c-3/5d)×(1/7c+3/5d)=(1/7c)^2-(3/5d)^2=1/49c^2-9/25d^2
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Ответ:
(1/7c-3/5d)×(1/7c+3/5d)=(1/7c)^2-(3/5d)^2=1/49c^2-9/25d^2