Bonjour
245/216
= (5 x 7 x 7) / (2 x 2 x 2 x 3 x 3 x 3)
= 245/216 → Fraction irréductible.
48/175
= (2 x 2 x 2 x 2 x 3) / (5 x 5 x 7)
= 48/175 → Fraction irréductible.
A×B ?
245/216 x 48/175 = 11 760/37 800 = (840 x 14) / (840 x 45) = 14/45
120/450
= (2 x 2 x 2 x 3 x 5) / (2 x 3 x 3 x 5 x 5)
= [(2 x 3 x 5) x (2 x 2)] / [(2 x 3 x 5) x (3 x 5)]
= (30 x 4) / (30 x 15)
= 4/15
1 925/3 185
= (5 x 5 x 7 x 11) / (5 x 7 x 7 x 13)
= [(5 x 7) x (5 x 11)] / [(5 x 7) x (7 x 13)]
= (35 x 55) / (35 x 91)
= 55/91
D × E ?
4/15 x 55/91 = 220/1 365 = (5 x 44) / (5 x 273) = 44/273
