Bonjour,
A = 1/3 + 2/7 = (1 × 7 + 2 × 3) / (3 × 7) = 13/21
B = 4/5 - 3/20 = (4 × 4) / (4 × 5) - 3/20 = 16/20 - 3/20 = (16 - 3) / 20 = 13/20
C = 3/8 × 11/7 = (3 × 11) / (8 × 7) = 33/56
D = 4/5 × 5/9 = 4/9 × 5/5 = 4/9
E = 3/5 × 7/6 = 7/5 × 3/6 = 7/5 × 1/2 = (7 × 1) / (5 × 2) = 7/10
F = 2/3 ÷ 3/7 = 2/3 × 7/3 = (2 × 7) / (3 × 3) = 14/9
G = 7/9 - 5/9 × 4/5 = 7/9 - 5/5 × 4/9 = 7/9 - 4/9 = (7 - 4) / 9 = 3/9 = (1 × 3) / (3 × 3) = 1/3
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Bonjour,
A = 1/3 + 2/7 = (1 × 7 + 2 × 3) / (3 × 7) = 13/21
B = 4/5 - 3/20 = (4 × 4) / (4 × 5) - 3/20 = 16/20 - 3/20 = (16 - 3) / 20 = 13/20
C = 3/8 × 11/7 = (3 × 11) / (8 × 7) = 33/56
D = 4/5 × 5/9 = 4/9 × 5/5 = 4/9
E = 3/5 × 7/6 = 7/5 × 3/6 = 7/5 × 1/2 = (7 × 1) / (5 × 2) = 7/10
F = 2/3 ÷ 3/7 = 2/3 × 7/3 = (2 × 7) / (3 × 3) = 14/9
G = 7/9 - 5/9 × 4/5 = 7/9 - 5/5 × 4/9 = 7/9 - 4/9 = (7 - 4) / 9 = 3/9 = (1 × 3) / (3 × 3) = 1/3