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注意要用行列式计算

Posted by yygy at 2012-11-21 22:58:13 on Problem 2624 
x=(c*e-b*f)/(a*e-b*d);
y=(-c*d+a*f)/(a*e-b*d);
上面的AC

下面的WA

 x=(c*e-b*f)/(a*e-b*d);
y=(f-d*x)/(e);
因为e有可能为0
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