Webb12 apr. 2024 · 解:展开函数式得到2yx2+2xy+y=x2-2x-3 继而得到 (2y-1)x2+ (2y+2)x+ (y+3)=0 将上式看作x的二次方程,y组成了方程的系数。. 只有Δ>=0,x才有实值。. Δ= (2y+2)2-4 (2y-1) (y+3)=-4y2-12y+16>=0 推导出(y+4) (y-1)<=0 满. 极值 函数式 几何平均 算术平均 函数. 民科吧 的 一题 : ∂ f / ∂ x ... Webb29 mars 2024 · setVersion(int v) (了解)参数为 0(传统 Netscape cookie 规范编译)或 1(RFC 2109 规范编译)。 这个没用到,不是很懂 注意:cookie 不能发送中文,如果要发送中文,就需要进行特别处理。
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