А) (7p+2q)^2+(7p-2q)^2 б) (3d+5c)^2-(3d-5c)^2

chicheviup00zou chicheviup00zou    2   26.05.2019 00:20    0

Ответы
wartander595 wartander595  22.06.2020 08:22

(7p+2q)^2+(7p-2q)^2=

=49*q^2+28*p*q+49*p^2+4*q^2-28*p*q+49*p^2=

8*q^2+98*p^2

 

(3d+5c)^2-(3d-5c)^2=

=9*d^2+30*c*d+25*c^2-9*d^2+30*c*d-25*c^2=

=60*c*d

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