Question

Допоможіть!!!!!!!!!!!!!!!!!​

Answer 1

$2x^2+6xy-5x^2-9xy+3y^2=-3x^2+6xy-9xy+3y^2=-3x^2-3xy+3y^2$

Answer 2

Объяснение:

$2x {}^{2} + 6xy - 5x {}^{2} - 9xy + 3y {}^{2} =-3x^{2}+6xy-9xy+3y^{2} =-3x^{2}-3xy+3y^{2}$