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Sagot :

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

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