Répondre :
2+(3x+5)=2+5+3x=7+3x
B=7x-4(x-3)=7x-4x+12=3x+12
C=8x-(2-x)+(-7+4x)-(9x+1)=8x-2+x-7+4x-9x-1=4x-10
a) 2+(3x+5)
= 2 + 3x + 5
= 3x + 7
b) 7x-4(x-3)
= 7x -4x +12
= 3x + 12
c) 8x-(2-x) + (-7+4x) - (9x+1)
= 8x -2 +x -7 +4x -9x -1
= 4x -10
2+(3x+5)
b= 7x-4(x-3)
c=8x-
(2-x)+ (-7+4x ) -(9x+1)
2+(3x+5)=2+5+3x=7+3x
B=7x-4(x-3)=7x-4x+12=3x+12
C=8x-(2-x)+(-7+4x)-(9x+1)=8x-2+x-7+4x-9x-1=4x-10
a) 2+(3x+5)
= 2 + 3x + 5
= 3x + 7
b) 7x-4(x-3)
= 7x -4x +12
= 3x + 12
c) 8x-(2-x) + (-7+4x) - (9x+1)
= 8x -2 +x -7 +4x -9x -1
= 4x -10