Répondre :
a)
456 = 8 x 3 x 19
987 = 3 x 7 x 47
PPCM(456,987) = 8x3x7x19x47 = 150024
b)
369 = 9 x 41
741 = 3 x 13 x 19
PPCM(369,741) = 9 x 13 x 19 x 41 = 273429
456 = 2x 2 x 2 x 3 x 19
987 = 3 x 7 x 47
PPCM = 2 au cube x 3 x 7 x 47 = 7896
369 = 3 x 3 x 41 = 3² x 41
741 = 3 x 13 x 19
PPCM = 3² x 13 x 19 x 41 = 91 143