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Andreeacristina
a fost răspuns

x∈N
|2x-3|=9
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Răspuns :

Puffariin
|2x-3|= 9 => 2x-3= 9 sau 2x-3= -9 2x-3=9 2x= 9+3. 2x= 12. x=12/2. x = 6 2x-3= -9. 2x=-9+3. 2x= -6. x= -6/2. x= -3 x= {6, -3} x€ N => x=6

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