化简:|x+11|+|x-12|+|x+13|.
化简:|x+11|+|x-12|+|x+13|.
数学人气:365 ℃时间:2020-06-07 20:20:29
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①当x≤-13时,|x+11|+|x-12|+|x+13|=-x-11+12-x-x-13=-3x-12.②当-13≤x≤-11时,|x+11|+|x-12|+|x+13|=-x-11-x+12+x+13=-x+14,③当-11<x≤12,|x+11|+|x-12|+|x+13|=x+11-x+12+x+13=x+36,④当x≥12时,|x+11|+...
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