Bonjour,
a) 2/7 - 3/8 = (2×8)/(7×8) - (3×7)/(8×7) = 16/56 - 21/56 = (16-21)/56 = -5/56
b) 5/4 × 12/25 = (5×12)/(4×25) = (3×4×5)/(4×5×5) = 3/5
c) 2 - 1/9 = (2×9)/9 - 1/9 = 18/9 - 1/9 = (18-1)/9 = 17/9
d) 9/7 + 2/3 = (9×3)/(7×3) + (2×7)/(3×7) = 27/21 + 14/21 = (27+14)/21 = 41/21
e) 15/8 ÷ 3/7 = 15/8 × 7/3 = (15×7)/(8×3) = (3×5×7)/(8×3) = (5×7)/8 = 35/8
f) 5 ÷ 3/4 = 5 × 4/3 = (5×4)/3 = 20/3
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Bonjour,
a) 2/7 - 3/8 = (2×8)/(7×8) - (3×7)/(8×7) = 16/56 - 21/56 = (16-21)/56 = -5/56
b) 5/4 × 12/25 = (5×12)/(4×25) = (3×4×5)/(4×5×5) = 3/5
c) 2 - 1/9 = (2×9)/9 - 1/9 = 18/9 - 1/9 = (18-1)/9 = 17/9
d) 9/7 + 2/3 = (9×3)/(7×3) + (2×7)/(3×7) = 27/21 + 14/21 = (27+14)/21 = 41/21
e) 15/8 ÷ 3/7 = 15/8 × 7/3 = (15×7)/(8×3) = (3×5×7)/(8×3) = (5×7)/8 = 35/8
f) 5 ÷ 3/4 = 5 × 4/3 = (5×4)/3 = 20/3