(6一m)(6一n)(6一a)(6一b)二4则m+n+a+b=

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(6一m)(6一n)(6一a)(6一b)二4则m+n+a+b=
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(6一m)(6一n)(6一a)(6一b)二4则m+n+a+b=
(6一m)(6一n)(6一a)(6一b)二4则m+n+a+b=

(6一m)(6一n)(6一a)(6一b)二4则m+n+a+b=
参考:已知集合M={x| |x-4| + |x-1|