数学第十八题
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(1)
10-x >0
x<10 (1)
x-2≥0
x≥2 (2)
(1) and (2)
2≤x<10
A={ x|2≤x<10 }
B={x| x^2-6x+5≤0 }= {x| (x-1)(x-5)≤0} = { x| 1≤x≤5}
AUB = { x|1≤x<10}
A∩B = { x| 2≤x≤5)
P(x∈A∩B)
=(5-2)/(10-1)
=3/9
=1/3
(2)
P(x∉A)
= 1-P(x∈A)
=1- (10-2)/(10-1)
=1- 8/9
=1/9
10-x >0
x<10 (1)
x-2≥0
x≥2 (2)
(1) and (2)
2≤x<10
A={ x|2≤x<10 }
B={x| x^2-6x+5≤0 }= {x| (x-1)(x-5)≤0} = { x| 1≤x≤5}
AUB = { x|1≤x<10}
A∩B = { x| 2≤x≤5)
P(x∈A∩B)
=(5-2)/(10-1)
=3/9
=1/3
(2)
P(x∉A)
= 1-P(x∈A)
=1- (10-2)/(10-1)
=1- 8/9
=1/9
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