Bonjour,
(2x-3)(3x-6) = 6x²-12x-9x+18 = 6x²-21x+18
3/4 - 5/7 = (3×7)/(4×7) - (5×4)/(7×4)
= 21/28 - 20/28
= 1/28
3,75 h = 3 h + 0,75 h = 3 h + (0,75 × 60) mn = 3 h 45 mn
5x² + 11x = x(5x+11)
oui car si x=1 alors y=3
2(1)+1=3
