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Determinati valorile numarului natural "x" care verifica inegalitatile:
a)3•x+1>22; b)50-9•x<14; c)10+x:10>110; d)20:x-2>8.


Răspuns :

a) 3x>22-1
    3x>21⇒x>21:3⇒x>7       x=8,9,10,....
b)9x>50-14
9x>36⇒x>36:9⇒x>4            x=5,6,7....
c)x:10>110-10
x:10>100⇒x>100 ×10⇒x>1000           x=1001,1002....
d)20:x>8+2
20:x>10⇒x<20:10⇒x<2                 x=0,1.