Répondre :
A = -32x+12+(-30x+18)
a = -32x +12 -30x +18
A = -2x +30
B = 5.5t + 17.5 -3.2+24
B = 5.5t +38.3
C = -2 + 0.25x + 0.2x -100 -4x -24
C = -3.55x -126
A = x²+5x+4x+20 = x² +9x+20
B = 2x²+3x +22x +33 = 2x² +25x+33
C = 20a+8a² +2.5+a = 8a²+21a+2.5
D = 1t+2/3 t +3/2t +1 = 19t +1