bonjour
inverse de A = 1/10 et inverse de B = 1/35
somme = 1/10 + 1/35 = 35/350 + 10 /350 = 45/350 = 9/70
Inverse de C = 9/70 donc C = 70/9
5/4 x ( 4/3 - 7/15 )
= 5/4 x ( 20/15 - 7/15)
= 5/4 x 13/15
= 65/60
= 13/12
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bonjour
inverse de A = 1/10 et inverse de B = 1/35
somme = 1/10 + 1/35 = 35/350 + 10 /350 = 45/350 = 9/70
Inverse de C = 9/70 donc C = 70/9
5/4 x ( 4/3 - 7/15 )
= 5/4 x ( 20/15 - 7/15)
= 5/4 x 13/15
= 65/60
= 13/12