Explications étape par étape:
a = -4/45 × 15/16 = ( -4 ×15)/(3×15×4×4) = -1/12
b = -5/6 × -18/15 = (-5 × -3 × 6)/(-6 × 3 × 5) = 1
c = 12 × -4/3 = (4×3 × -4)/3 = -16
d = 1 × -4/7 =.-4/7
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Explications étape par étape:
a = -4/45 × 15/16 = ( -4 ×15)/(3×15×4×4) = -1/12
b = -5/6 × -18/15 = (-5 × -3 × 6)/(-6 × 3 × 5) = 1
c = 12 × -4/3 = (4×3 × -4)/3 = -16
d = 1 × -4/7 =.-4/7