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\(\left ( {1+\tan {20°}} \right )\left ( {1+\tan {21°}} \right )\left ( {1+\tan {22°}} \right )\left ( {1+\tan {23°}} \right )\left ( {1+\tan {24°}} \right )\left ( {1+\tan {25°}} \right )=\)___.
参考答案:8
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