Bonjour !
Exercice 1:
[tex]A = t \times 8\\ = 8t[/tex]
[tex]B = 3 \times x \\ = 3x[/tex]
[tex]C = 3 + x \\ = x + 3[/tex]
(on ne peut pas simplifier)
[tex]D = m \times m \\ = {m}^{2} [/tex]
[tex]F = 1 \times m \\ = m[/tex]
[tex]G = 0 \times m \\ = 0[/tex]
Exercice 2 :
[tex]A = a \times 4 \\ = 4a[/tex]
[tex]B = 4 \times a \\ = 4a[/tex]
[tex]C = a + a + a + a \\ = 4a[/tex]
[tex]D = a \times a \\ = {a}^{2} [/tex]
[tex]E = a + a \\ = 2a[/tex]
[tex]F = 1 \times a \\ = a[/tex]
[tex]G = 0 \times a \\ = 0[/tex]
[tex]H = 8 \times a + 2 \\ = 8a + 2[/tex]
[tex]I = 5 + 3 \times a \\ = 3a + 5[/tex]
Exercice 3 :
[tex]A = 5 \times m + 1 \\ = 5m + 1[/tex]
[tex]B = a \times 9 - 4 \\ = 9a - 4[/tex]
[tex]C = c \times c \\ = {c}^{2} [/tex]
[tex]D = 3 + 1 \times x \\ = x + 3[/tex]
[tex]E = d \times d \times d \\ = {d}^{3} [/tex]
[tex]F = 0 \times a + b \\ = b[/tex]
[tex]G = 6x \times 5y \\ = 30xy[/tex]
[tex]H = a \times a \times a - b \times b \\ = {a}^{3} - {b}^{2} [/tex]
Bonne soirée
