集合A={(x,y)丨x^2+mx-y+2=0} 集合B={(x,y)丨x-y+1=0 且0≤x≤2} 又 A∩B≠空集,求实数m的取值范围
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集合A={(x,y)丨x^2+mx-y+2=0} 集合B={(x,y)丨x-y+1=0 且0≤x≤2} 又 A∩B≠空集,求实数m的取值范围
集合A={(x,y)丨x^2+mx-y+2=0} 集合B={(x,y)丨x-y+1=0 且0≤x≤2} 又 A∩B≠空集,求实数m的取值范围
集合A={(x,y)丨x^2+mx-y+2=0} 集合B={(x,y)丨x-y+1=0 且0≤x≤2} 又 A∩B≠空集,求实数m的取值范围
A={(x,y)丨x^2+mx-y+2=0}
= { (x,y) | y=x^2+mx+2}
B={(x,y)丨x-y+1=0 且0≤x≤2}
= {(x,y)丨y=x+1 且0≤x≤2}
A∩B≠空集, then
x^2+mx+2 = x+1
x^2+(m-1)x+1=0
for real roots
△≥0
(m-1)^2 - 4 ≥0
m^2 -2m -3 ≥0
(m-3)(m+1)≥0
-1≤m≤3
A的集合=(-m+根号下m^2-8)/2 和(-m-根号下m^2-8)/2 B的集合就求出最值(0,1)和(2,3)再求出M的集合就可以了。
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