Question

Упростите выражение
3a(a-2)-2a(a-3)
5b(b-c)+c(2b-c)

Answer 1

3a(a-2)-2a(a-3) = 3a^2-6a-2a^2+6a=a^2
5b(b-c)+c(2b-c)= 5b^2-5bc+2bc-c^2=5b^2-3bc-c^2