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例子
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方程a_1^2+2*a_2^2+3*a_3^2=9的解(a_1,a_2,a_3)。
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( 1, 2, 0), ( 1, -2, 0),
(-1,2,0),(-1,-2,0),
( 2, 1, 1), ( 2, 1, -1),
( 2, -1, 1), ( 2, -1, -1),
(-2, 1, 1), (-2, 1, -1),
(-2, -1, 1), (-2, -1, -1),
( 3, 0, 0), (-3, 0, 0).
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