Bonsoir,
a) 5/12 - 5/3 + 1/6 - 2/9
= (5×3)/(12×3) - (5×12)/(3×12) + (1×6)/(6×6) - (2×4)/(9×4)
= 15/36 - 60/36 + 6/36 - 8/36
= -47/36
b) 3/7 + 3/4 - 5/2 - 17/8
= (3×8)/(7×8) + (3×14)/(4×14) - (5×28)/(2×28) - (17×7)/(8×7)
= 24/56 + 42/56 - 140/56 - 119/56
= -193/56
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Bonsoir,
a) 5/12 - 5/3 + 1/6 - 2/9
= (5×3)/(12×3) - (5×12)/(3×12) + (1×6)/(6×6) - (2×4)/(9×4)
= 15/36 - 60/36 + 6/36 - 8/36
= -47/36
b) 3/7 + 3/4 - 5/2 - 17/8
= (3×8)/(7×8) + (3×14)/(4×14) - (5×28)/(2×28) - (17×7)/(8×7)
= 24/56 + 42/56 - 140/56 - 119/56
= -193/56