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设x为正整数,且满足3的x+1次方乘2的x次方-3的x次方乘2的x+1次方=216,求(1/x)的-x次方的值.
人气:491 ℃ 时间:2020-03-21 18:54:31
解答
x+1 x x x+1 3 x 2 - 3 x 2 = 216 ____________________________ x x x x 3 x 3 x 2 - 2x3 x 2=216 ___________________________ x x 3x 6 - 2 x 6 = 216 _______________________________ x 6 = 216 ________________________________ x=3 (1/x)的-x次方的值=27
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