[中學] 代數不等式

看板Math作者時間12年前 (2013/08/28 18:34), 編輯推噓1(1推 0噓 0→)
留言1則, 1人參與, 最新討論串1/1
Find the necessary and sufficient conditions of a_1,a_2,b_1, and b_2 with a_1>0,a_2<0,b_1>0, and b_2<0 such that a_1*b_1*x^3+a_1*b_2*x^2*y+a_2*b_1*x*y^2+a_2*b_2*y^3\geq 0 for all x,y>0 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.4.181
推
08/28 19:22, , 1F
=> (a_1t^2+a_2)(b_1t+b_2)≧0 for all t＞0
08/28 19:22, 1F
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