👤

7x-9x= ; 9x-5-7x+9= ; (-3x^2y)•(+2xy^2)= ;​

Răspuns :

[tex]7x - 9x = (7 - 9)x = - 2x[/tex]

[tex]9x - 5 - 7x + 9 = 2x + 4 = 2(x + 2)[/tex]

[tex]( - 3x {}^{2y} ) \times (2xy {}^{2}) = - 6x {}^{2y + 1} \times y {}^{2} [/tex]