已知A={x|1/32≤2的-x次方≤4},B={x|x²-3mx+2m²-m²-1
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已知A={x|1/32≤2的-x次方≤4},B={x|x²-3mx+2m²-m²-1
已知A={x|1/32≤2的-x次方≤4},B={x|x²-3mx+2m²-m²-1
已知A={x|1/32≤2的-x次方≤4},B={x|x²-3mx+2m²-m²-1
(1)
A={x|1/32≤2的-x次方≤4}
1/32≤2的-x次方≤4
2^(-5)≤2^(-x)≤2^2
∴-5≤-x≤2
∴A=[-2,5]
∵x∈N
∴A={0,1,2,3,4,5}
A的非空真子集的个数为
2^6-1=63
(2)
若A包含于B,则A是B的子集,
B={x|x²-3mx+2m²-m-1