Question

решите: (5с-7p)(7c+5p)-(7c-5p)(5c+7p) очень надо

Answer 1

(5с-7p)(7c+5p)-(7c-5p)(5c+7p)=35c²-49cp+25cp-35p²-35c²+25cp-49cp-+35p²=
=-49cp+25cp+25cp-49cp=-48cp

Answer 2

=35с^2+25рс-49рс-35р^2-35с^2-49рс+25рс+35р^2=-48рс

Answer 3

неправильно