已知|x|≤1,|y|≤1,求证|x+y/1+xy|≤1.已知|x|≤1,|y|≤1,求证|x+y/1+xy|≤1 "| |"代表绝对值
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已知|x|≤1,|y|≤1,求证:|x+y/1+xy|≤1.已知|x|≤1,|y|≤1,求证:|x+y/1+xy|≤1.求证:|(x+y)/(1+xy)|≤1.
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