计算:80°-45°31′;28°24′+26°34′;12°28′×3时钟上时针由2点30分走到2点55分,时针转过多少度?一个角的余角比它的补角的1/2还少20°,这个角的度数是?如图,在边长为16cm的正方形纸板的四个角各剪
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![计算:80°-45°31′;28°24′+26°34′;12°28′×3时钟上时针由2点30分走到2点55分,时针转过多少度?一个角的余角比它的补角的1/2还少20°,这个角的度数是?如图,在边长为16cm的正方形纸板的四个角各剪](/uploads/image/z/2649733-61-3.jpg?t=%E8%AE%A1%E7%AE%97%3A80%C2%B0-45%C2%B031%E2%80%B2%3B28%C2%B024%E2%80%B2%2B26%C2%B034%E2%80%B2%3B12%C2%B028%E2%80%B2%C3%973%E6%97%B6%E9%92%9F%E4%B8%8A%E6%97%B6%E9%92%88%E7%94%B12%E7%82%B930%E5%88%86%E8%B5%B0%E5%88%B02%E7%82%B955%E5%88%86%2C%E6%97%B6%E9%92%88%E8%BD%AC%E8%BF%87%E5%A4%9A%E5%B0%91%E5%BA%A6%3F%E4%B8%80%E4%B8%AA%E8%A7%92%E7%9A%84%E4%BD%99%E8%A7%92%E6%AF%94%E5%AE%83%E7%9A%84%E8%A1%A5%E8%A7%92%E7%9A%841%2F2%E8%BF%98%E5%B0%9120%C2%B0%2C%E8%BF%99%E4%B8%AA%E8%A7%92%E7%9A%84%E5%BA%A6%E6%95%B0%E6%98%AF%3F%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E8%BE%B9%E9%95%BF%E4%B8%BA16cm%E7%9A%84%E6%AD%A3%E6%96%B9%E5%BD%A2%E7%BA%B8%E6%9D%BF%E7%9A%84%E5%9B%9B%E4%B8%AA%E8%A7%92%E5%90%84%E5%89%AA)
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