(1/7 + 2/21) x (1/2 + 1/5) = (1 x 3 / 7 x 3 + 2/21) x (1 x 5 / 2 x 5 + 1 x 2 / 5 x 2) = (3/21 + 2/21) x (5/10 + 2/10) = 5/21 x 7/10 = 35/210 = 35 x 1 / 35 x 6 = 1/6
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fredericcadot
Merci bcp Maudmarine ! comprend pas les passionnés de math du dimanche matin :p
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Verified answer
Bonjour,(1/7 + 2/21) x (1/2 + 1/5)
= (1 x 3 / 7 x 3 + 2/21) x (1 x 5 / 2 x 5 + 1 x 2 / 5 x 2)
= (3/21 + 2/21) x (5/10 + 2/10)
= 5/21 x 7/10
= 35/210
= 35 x 1 / 35 x 6
= 1/6