Réponse :
bonsoir
Explications étape par étape :
→ g(3) = -2/3 × 3 + 5/4 ( on remplace x par 3)
→ g(3) = - 6/3 + 5/4
→ g(3) = -2 + 5/4
→ g(3) = (-8 + 5 )/4
→ g(3) = -3/4
→ g(x) = -2x/3 + 5/4 et g(x) = 3
→ -2x/3 + 5/4 = 3
→ -2x/3 = 3 - 5/4
→ -2x/3 = ( 12 - 5)/4
→ -2x/3 = 7/4
→ -2x = 7/4 x 3
→ -2x = 21/4
→ x = 21/4 × -1/2
→ x = - 21/8
h(7) = -2 × 7 + 5 (on remplace x par 7)
h(7) = -14 + 5
h(7) = - 9
h(x) = -2x + 5 et h(x) = 7
→ -2x + 5 = 7
→ -2x = 7 - 5
→ -2x = 2
→ - x = 2/2
→ x = -1
→ i(1/4) = 1/2 × 1/4 - 3
→ i(1/4) = 1/8 - 3
→ i(1/4) = 1/8 - 24/8
→ i(1/4) = -23/8
i(x) = x/2 - 3 et i(x) = 1/4
→ x/2 - 3 = 1/4
→ x/2 = 1/4 + 3
→ x/2 = 1/4 + 12/4
→ x/2 = 13/4
→ x = 13/4 x 2
→ x = 26/4
→ x = 13/2
bonne soirée