упростите выражение:
5a(a-b+c)-5b(a-b-c)-5c(a+b+c)

5а(a-b+c)-5b(a-b-c)-5c(a+b+c)=5a²-5ab+5ac-5ab+5b²+5bc-5ac-5bc-5c²=5a²-10ab-5b²-5c²=5(a²-2ab-b²-c²)

5a(a-b+c)-5b(a-b-c)-5c(a+b+c)= 5а²- 5аb+5ac-5ac-5bc-5c²=