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(9n +15):3<20 exercitiu

Răspuns :

Raluca98t
(9n+15):3<20
3n+5<20
3n<20-5
3n<15
n<15/3
n<5
n∈(-oo;5)
(9n+15):3<20
9n+15<20x3
9n+15<60
9n<60-15
9n<45
n<45:9
n<5⇒n∈{0,1,2,3,4}

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