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把1周角分成360等分,每一份所对的角叫做1度角。记作 “1”,1,以度,分,秒为单位的角的度量制叫做角度制,把1度的角60等分,每一份所对的角叫做1分角。记作 “1 ”,把1分的角60等分,每一份所对的角叫做1秒角。记作 “1 ”,归纳,填空(1)34.50= 0 /(2)112.270= 0 / /解:(1)34.50=340+0.50 =340+0.560/ =340+3 0/=34030/ (2)112.270=1120+0.2760/ =1120+16.2/ =1120+16/+0.260/ =112016/12/,34,30,112,16,12,2、把下列各题结果化成度72036/ (2)37014/24/解:(1)72036/=720+36/ =720+(3660)0 =720+0.60 =72.60,(2)37014/24/=370+14/+24/ =370+14/+(2460)/ =370+14/+0.4/ =370+14.4/ =370+(14.460)0 =370+0.240=37.240,用度、分、秒表示:0.7516.24 34.37 (5)1800 (6)48 ,45,2700,16,14,24,34,22,12,0.5,0.8,讨论 3 15 与3 . 15相等吗?,