Réponse :
Bonsoir
Explications étape par étape :
Ex1)
R = 3 * (-7) + (5-8-7) * ( 2 -14÷2)
R = -21 + (5-15) * ( 2-7)
R = - 21 + (-10) * (-5)
R = -21 + 50
R = 29
Ex2)
1) y = -4
A = 9 - 6 * (-4) + (-4)^2
A = 9 + 24 + 16
A = 49
2)
3(2x-7) = 3*2x-3*7 = 6x-21
5x(1+4x) = 5x*1 + 5x*4x = 5x + 20x^2
(8-2b)*7b = 8*7b - 2b*7b = 56b - 14b^2
-2(a+5) = -2*a + (-2)*5 = -2a - 10
(8-3y) *(-6) = 8*(-6) - 3y*(-6) = -48 + 18y
9x(-6x+5) = 9x*(-6x) + 9x * 5 = - 54x^2+45x
