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Sagot :

Bonsoir,

Ex. 7 :

1 - 1/3 - 1/5 = 15/15 - 5/15 - 3/15 = 7/15

Ex. 8 :

a) a = -7/4 - 5/2 = -7/4 - 10/4 = -17/4

b) t = 14/6 - 2/15 = 70/30 - 4/30 = 66/30 = 33/15 = 11/5

c) 2x - 7/2 = x + 1 ⇒ 2x - x = 1 + 7/2

                            ⇒ x = 9/2

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