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設:這個角為A 則:餘角為90°-A、補角為180°-A 根據題意得:90°-A=3(180°-A)/7 解得:A=22.5° 180°-22.5°=157.5° 答:補角為157.5° 希望我的回答對你有幫助,採納吧O(∩_∩)O!
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