Ache uma solução de apenas número inteiros para a equação:
(a/b) + (c/d) = (a + c)/(b + d)
some integer solutions are
(a,b,c,d) = ( -1, 1, 1, 1)
(a,b,c,d) = ( 0, -2, 0, -1)
(a,b,c,d) = (0, 2, 0, 1)
(a,b,c,d) = ( 2, 3, -2, 3)
(a,b,c,d) = (4, 2, -1, 1)
(a,b,c,d) = (20, 2, -5, -1)
and infinitely many others
ok
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some integer solutions are
(a,b,c,d) = ( -1, 1, 1, 1)
(a,b,c,d) = ( 0, -2, 0, -1)
(a,b,c,d) = (0, 2, 0, 1)
(a,b,c,d) = ( 2, 3, -2, 3)
(a,b,c,d) = (4, 2, -1, 1)
(a,b,c,d) = (20, 2, -5, -1)
and infinitely many others
ok