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當三個力的方向相同時,合力最大,F合=5+6+9N=20N.5N和6N兩個力的合力大於等於1N,小於等於11N,而9N在這合力範圍內,所以三個力的合力能為零.則合力的最小值為0.合力範圍為:0~20N.故答案為:0~20N.
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