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19.Determinati numerele naturale care verifica inegalitatile:d)243:(x-4) > 9 si x : 5 ≥ 2

Răspuns :

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243:(x-4)>9
243>9*(x-4)
9*(x-4)<243
x-4<243:9
x-4<27
x<27+4
x<31
solutiile inecuatiei sunt::0,1,2,3,4,5,,,,,,,,,,,,,,,,,,,,,,,30 
x:5> sau egal2
x>sau egal 2x5
x>sau egal 10
solutiile sunt:10,11,12,,,,,,,,,,,,,,,,,,,30.............
243:(x-4)>9
x-4>243:9
x-4>27
x>27+4
x>31

x:5≥2
x≥5·2
x≥10
x∈[10,+α)


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