Réponse:
bonjour,
Explications étape par étape:
A= -7x + 3
= -7×1/3 + 3
= -7/3 +3
= -7/3 + 3×3/1×3
= -7/3 + 9/3
= 2/3
B= x(x+1)
= 1/3(1/3 + 1)
= 1/3×1/3 + 1/3×1
= 1/9 + 1/3
= 1/9 + 1×3/3×3
= 1/9 + 3/9
= 4/9
C= (2x - 1)(7 + 8x)
= (2×1/3 - 1)(7+8×1/3)
= (2/3 - 1)(7 + 8/3)
= 2/3×7 + 2/3×8/3 - 1×7 - 1×8/3
= 14/3 + 16/3 - 7 - 8/3
= 14/3 + 16/3 - 7×3/1×3 - 8/3
= 14/3 + 16/3 - 21/3 - 8/3
= 1/3
D= 5(3x-4)-x
= 5(3×1/3 - 4) - 1/3
= 5(3/3 - 4) - 1/3
= 5( 1 - 4 ) - 1/3
= 5×1 - 5×4 - 1/3
= 5 - 20 - 1/3
= 5×3/1×3 - 20×3/1×3 -1/3
= 15/3 - 60/3 - 1/3
= -46/3
j'espère que je t'ai aidé
