Ta có : x2 + 45 = y2
Nếu y2 chẵn => y= 2( vì y là số nguyên tố) Khi đó x2 + 45 = 4 (loại).Do đó y2 lẻ.
=> x2 chẵn nên x = 2.
Với x = 2 khi đó 22 + 45 = y2 <=> 49 = y2 <=> 72 = y2 <=> y = 7.
Vây x=2; y=7.
tim so nguyen to x va y sao cho x^2 + 45 = y^2
tim cac so nguyen to x,y sao cho:x2+45=y2
tim x dua vao quan he uoc boi:
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