Réponse:
a.
[tex]5x \times 3 \\ = 15x[/tex]
b.
[tex]2x - 12x \\ = - 10x[/tex]
c.
[tex]2 + 4x \\ = 2(1 + 2x)[/tex]
d.
[tex]3x ^{2} - 8x \\ = (3 - 8) x ^{2} \\ = - 5x {}^{2} [/tex]
e.
[tex]5x \times 2x \\ = 10x {}^{2} [/tex]
f.
[tex]4x \times x {}^{2} \\ = 4x ^{3} [/tex]
g.
[tex]5x {}^{3} \times 3x {}^{2} \\ = x {}^{2} \times (5x + 3)[/tex]
h.
[tex]9x {}^{2} + x \\ = 10x {}^{2} [/tex]
i.
[tex]2x \times 3y \\ = 6xy[/tex]
j.
[tex] 3x + 4y - 2x + y \\ = x + 3y[/tex]
j'espère t'avoir aider.
