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①當m為最大值時,排序為:m,9,8,6.根據題意得m+9+8+64=9+82.解得m=11;②當m為最小值時,排序為:9,8,6,m.根據題意得m+9+8+64=8+62.解得m=5;③當m既不是最大,也不是最小時,排序為:9,8,m,6或9,m,8,6.根據題意得m+9+8+64=8+m2.解得m=7.∴m的值為5或7或11.
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