est ce que vous pouvez faire les exo 5 et 6? svp

Exercice 5 :
a) 7(-3x + 5)
=7*(-3x) + 7*5
= -21x +35

b) -5(-2x+4)
= -5*(-2x) + (-5)*4
=10x - 20

c) 2-3 (5x-7)
= -1 (5x-7)
= -1*5x + (-1) * (-7)
= -5x + 7

a =7(-3x+5) =  -21x +35

b = -5(-2x+4) = 10x -20

c = 2 -3(5x-7) = 2 -15x+21 =  -15x +23

d= 4(-2x+1) -3(7x-2) =  -8x+4 -21x+6 =  -29x +10

2/

a = -3(x-1.7) -5y
a = -3(-2.3-1.7)  -5*-4
a = -3( -4) +20
a = 12 +20
a = 32


a = -3(x-1.7) -5y
a = -3x + 5.1 -5y
a =  -3*-2.3 +5.1 -5(-4)
a = +6.9 +5.1 +20
a = 32