delta=(3k-5)^2+96>0
(1)若x1/x2=3/2,設(shè)x1=3m,x2=2m
由韋達(dá)定理
? 則X1+X2= (3K-5)/4=5m
? X1*X2=-3K^2/2=6m^2
由K^2=-4m^2,及m不等于0知此時(shí)無解
(2)若x1/x2=" />

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歡迎您訪問數(shù)學(xué)卷子27題!

數(shù)學(xué)卷子27題

更新時(shí)間:2022-12-18 10:10:29作者:admin2

該方程的
delta=(3k-5)^2+96>0
(1)若x1/x2=3/2,設(shè)x1=3m,x2=2m
由韋達(dá)定理
? 則X1+X2= (3K-5)/4=5m
? X1*X2=-3K^2/2=6m^2
由K^2=-4m^2,及m不等于0知此時(shí)無解
(2)若x1/x2=-3/2,設(shè)x1=3m,x2=-2m
由韋達(dá)定理
? 則X1+X2= (3K-5)/4=m
? X1*X2=-3K^2/2=-6m^2
聯(lián)立消去m,得到K的方程(3K-5)^2=(2K)^2,解得K=1,5
經(jīng)過驗(yàn)證K=1,5滿足題意.
K=1,5

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