26
√(2a+2b+11a+11b)∈N
13(a+b) patrat perfect
a+b=13
a=9...b=4
a=8....b=5
a=7 ....b=6
a=6...b=7
a=5 ...b=9
ab numar ∈{84;85;76;67;58;49}
(2x-1)/(x+1)∈N si p.p.
(2x+2-3)/(x+1) p.p.
2-3/(x+1) p.p
x+1∈D3N={1;3}
x+1=1...x=0 dar fractia =2-3/1=2-3=-1∉N
x+1=3 ...x=2 si fractia=2-3/3=2-1=1 p.p
solutie unica x=2
