bjr
il faut donc calculer :
7/8 x (3/7 + 1/3)
= 7/8 x (9/21 + 7/21)
= 7/8 x 16/21
= 7x16/8x21
= 7x2x8/8x7x3
= 2/3
=> inverse de 2/3 = 3/2 = 1,5 donc vrai
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bjr
il faut donc calculer :
7/8 x (3/7 + 1/3)
= 7/8 x (9/21 + 7/21)
= 7/8 x 16/21
= 7x16/8x21
= 7x2x8/8x7x3
= 2/3
=> inverse de 2/3 = 3/2 = 1,5 donc vrai