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(1)U={1,2,3,4,5,6,7,8},A={1,2,3},B={3,4,5,6},求?UA∩?UB;(2)已知函数f(x)=x+3+
(1)U={1,2,3,4,5,6,7,8},A={1,2,3},B={3,4,5,6},求?UA∩?UB;(2)已知函数f(x)=x+3+log2(x-4),求其定义域.
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推荐答案 推荐于2016-09-04
(1)∵U={1,2,3,4,5,6,7,8},A={1,2,3},B={3,4,5,6},
∴?
U
A={4,5,6,7,8};?
U
B={1,2,7,8},
则?
U
A∩?
U
B={7,8};
(2)根据题意得:
x+3≥0
x?4>0
,即
x≥?3
x>4
,
解得:x>4,
则函数的定义域为(4,+∞).
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