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题型:单选题 题类:常考题 难易度:普通
映射++++++++++++++++++++++++++++++++
(x , y)
(n , n)
(m , n)
(n , m)
f(x , y)
n
m-n
m+n
则f(3,5)={#blank#}1{#/blank#},使不等式f(2x , x)≤4成立的x的集合是{#blank#}2{#/blank#}.
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