Question

3a(a-b)+b(2a-b)
и
3c(c-2)-(c-3) во 2 степени

Answer 1

1)3a(a-b)+b(2a-b)=3a²-3ab+2ab-b²=3a²-ab-b²
2)3c(c-2)-(c-3)²=3c²-6c-(c²-6c+9)=3c²-6c-c²+6c-9=2c²-9