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Sagot :

a. (x-3)(x-2) = 0 
Soit x-3 = 0 soit x-2 = 0
x-3 = 0
x = 3
x-2 = 0
x = 2

b. (3-y)(y-7) = 0
Soit 3-y = 0 soit y-7 = 0
3-y = 0
y = 3
y-7 = 0
y = 7
c'est tout a fait sa :)

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