Sagot :
Alors
D= 4(4x²-4x+1)+2x²-x
D=16x²-16x+4+2x²-x
D=18x²-17x+4
FACTORISATION D=x(18x-17)+4
E=(30,25x²-27,5x+6,25)-(12,25x²-10,5x+2,25)
E= 30,25x²-27,5x+6,25-12,25x²+10,5x-2,25
E= 18x²-17x+4
FACTORISATION E= x(18x-17)+4
F= 4x²-1+ 14x²-10x-7x+5
F= 18x²-17x+4
FACTORISATION F= x(18x-17)+4