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韦达定理
魔法绿骑士
准尉 十一级
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Floor 1 Posted at: 12/23/11 21:56
设方程为ax^3+bx^2+cx+d=0 则有x1*x2*x3=-d/a;x1*x2+x2*x3+x3*x1=c/a;x1+x2+x3=-b/a
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Clicks: 1372 Replies: 0
Author: 魔法绿骑士
Last reply: 魔法绿骑士
Last reply time: 12/23/11 21:56
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