Explications étape par étape:
12/18 = (6×2)/(6×3) = 2/3
40/15 = ((5×8)/(5×3) = 8/3
32/24 = (8×4)/(8×3) = 4/3
33/110 = (11×3)/(11×10) = 3/10
25/100 = (25×1)/(25×4) = 1/4
63/108 = (9×7)/(9×12) = 7/12
17/68 = (17×1)/(17×4) = 1/4
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Explications étape par étape:
12/18 = (6×2)/(6×3) = 2/3
40/15 = ((5×8)/(5×3) = 8/3
32/24 = (8×4)/(8×3) = 4/3
33/110 = (11×3)/(11×10) = 3/10
25/100 = (25×1)/(25×4) = 1/4
63/108 = (9×7)/(9×12) = 7/12
17/68 = (17×1)/(17×4) = 1/4
.40/15=40 ÷ 5 / 15 ÷ 5= 8/3
. 32/24= 4x8/4x6 = 8 ÷2 / 6 ÷2 = 4/3
.33/110 = 11x3 / 11x10= 3/10
.25/100= 25 ÷5 / 100 ÷5 = 5 ÷5/ 20 ÷5=1/4
.63/108=63 ÷3/108 ÷3=21 ÷7/36 ÷7=7/12
Ps: « / » signifie « sur » comme 7 sur 2 (7/2)