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Sagot :

JPMORIN3

bjr

x/y = 5/8  (1)   et    y/z = 4/7   (2)

1)

calculer x/z

x/y * y/z = x/z = 5/8 * 4/7 = 5/2 * 1/7 = 5/14

x/z = 5/14

2)

x/z = 5/14   =>  z/x = 14/5  =>     2z/x = 28/5

x/y = 5/8  =>    y/x = 8/5

(2z - y)/x = 2z/x - y/x = 28/5 - 8/5 = 20/5 = 4

(2z - y)/x = 4

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