a=-2 b²=25 2/1a-5/3b=a=-2 b²=25 1/2a-3/5b=
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a=-2 b²=25 2/1a-5/3b=a=-2 b²=25 1/2a-3/5b=
a=-2 b²=25 2/1a-5/3b=
a=-2 b²=25 1/2a-3/5b=
a=-2 b²=25 2/1a-5/3b=a=-2 b²=25 1/2a-3/5b=
b=±5;
a/2-3b/5=-1±3=-4或2