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1.Aflati x€N daca
a) 7/x € N
b) 9/x+1€N
c) 5/2x+1€N
d)x+7/x-1€N
2.Aflati cifra x daca
__ __
3x/x6=5/8
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7x/x4=13/14
__ __ __
4x+x3/x8

/ reprezinta supra