设集合A={x|-4<x<2},B={x|x²-3ax+2a²=0,x∈R},求使B包含于A的实数a的范围.
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![设集合A={x|-4<x<2},B={x|x²-3ax+2a²=0,x∈R},求使B包含于A的实数a的范围.](/uploads/image/z/7277973-69-3.jpg?t=%E8%AE%BE%E9%9B%86%E5%90%88A%3D%7Bx%7C-4%EF%BC%9Cx%EF%BC%9C2%7D%2CB%3D%7Bx%7Cx%26sup2%3B-3ax%2B2a%26sup2%3B%3D0%2Cx%E2%88%88R%7D%2C%E6%B1%82%E4%BD%BFB%E5%8C%85%E5%90%AB%E4%BA%8EA%E7%9A%84%E5%AE%9E%E6%95%B0a%E7%9A%84%E8%8C%83%E5%9B%B4.)
设集合A={x|-4<x<2},B={x|x²-3ax+2a²=0,x∈R},求使B包含于A的实数a的范围.
设集合A={x|-4<x<2},B={x|x²-3ax+2a²=0,x∈R},求使B包含于A的实数a的范围.
设集合A={x|-4<x<2},B={x|x²-3ax+2a²=0,x∈R},求使B包含于A的实数a的范围.
x²-3ax+2a²=0 (x-a)(x-2a)=0 x=a,x=2a
B包含于A
(1)a>0,a