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Sagot :

3)

1 - 2 X x X ( x - 5 ) - 2 X 3

x = inconnu

X = multiplication

4)

A = 5x     B = y       C = 5a         D = 6x²

5)

a) 3 = 6 = 0                -5 = 25 = 19

b) ( x X 2 ) - 6

c) x = -0,5 = -1 = -7

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