Sagot :
A= (-5x+7)-(8-3x)+x
A = -5x+7-8+3x+x
A=-x-1
B= 3x-(-5+ x)+(-3x+ 3)
B= 3x+5-x-3x+3
B=-x+8
C= -4x²-(2x²-3x+1)+(-2x+3)
C= -4x²-2x²+3x-1-2x+3
C=-6x²+x+2
A = -5x+7-8+3x+x
A=-x-1
B= 3x-(-5+ x)+(-3x+ 3)
B= 3x+5-x-3x+3
B=-x+8
C= -4x²-(2x²-3x+1)+(-2x+3)
C= -4x²-2x²+3x-1-2x+3
C=-6x²+x+2
a)-5x+7-8+3x+x=-1x-1
b)3x+5+x+-3x+3=x+8
c)-4x²-2x²+3x-1-2+3=-6x²+3x
b)3x+5+x+-3x+3=x+8
c)-4x²-2x²+3x-1-2+3=-6x²+3x