Упростите вырожееия 3x(x+y+c)-3y(x-y-c)-3c(x+y-c)

Question

Упростите вырожееия 3x(x+y+c)-3y(x-y-c)-3c(x+y-c)

Answer 1

3x(x+y+c)-3y(x-y-c)-3c(x+y-c)=3x2+3xy+3xc-3xy+3y2+3yc-3xc-3yc+3c2=3x2+3y2+3c2=3(x2+y2+c2)

Answer 2

3х²+3ху+3хс-3ух+3у²+3ус-3сх-3ус+3с²=3х²+3у²+3с²-6хс=3(х²+у²+с²-2хс)