Explications étape par étape:
pour diviser 2 fractions on multiplie la 1ère par l´inverse de la 2ème.
a) 5/4 ÷ 7/3 = 5/4 × 3/7 = (5×3)/(4×7) = 15/28
b) 12/17 ÷ -4 = 12/17 ÷ -4/1 = 12/17 × 1/-4 = (12×1)/(17×-4)
= 12/-68
c) -25/33 ÷ -35/55 = -25/33 × 55/-35 =
(-5×5×5×11)/(3×11×-5×7) = (5×5)/(3×7) = 25/21
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Explications étape par étape:
pour diviser 2 fractions on multiplie la 1ère par l´inverse de la 2ème.
a) 5/4 ÷ 7/3 = 5/4 × 3/7 = (5×3)/(4×7) = 15/28
b) 12/17 ÷ -4 = 12/17 ÷ -4/1 = 12/17 × 1/-4 = (12×1)/(17×-4)
= 12/-68
c) -25/33 ÷ -35/55 = -25/33 × 55/-35 =
(-5×5×5×11)/(3×11×-5×7) = (5×5)/(3×7) = 25/21