38 Développe et réduis les expressions suivantes :
A = 3(2x - 6) - (3 - 5x)
B = (5 - 2y) - (-3y + 7)
C = 4(6 + z) + (z − 3)(2 - z)
D = (2t - 5)(3t+ 2) - (1² + 6)
A = 3(2x - 6) - (3 - 5x)
B = (5 - 2y) - (-3y + 7)
C = 4(6 + z) + (z − 3)(2 - z)
D = (2t - 5)(3t+ 2) - (1² + 6)
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Explications étape par étape:
A = 6x - 18 - 3 + 5x
A = 11x - 21
B = 5 - 2y + 3y - 7
B = y - 2
C = 24 + 4z + 2z - z² - 6 + 3z
C = -z² + 9z + 18
D = 6t² + 4t - 15t - 10 - 1 - 6
D = 6t² - 11t - 17