1、角度的换算,自己动手,一定能行!,1、分别画出300,450,600,900的角; 2、你能画出150,750,1050,1200,1350、1500和1650的角吗?画一画。,一周角=2平角=4直角=3600 一平角=1800 一直角=900 10=60/ 1/=60/ (读成1度等于60分,1分等于60秒 ),请你要牢记哟!,例题 1 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/
2、+0.260/ =112016/12/,34,30,112,16,12,10=60/ 1/=60/,例题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,例题3 计算,(1) 12036/56/ + 45024/35/ 解:(1)原式=(12+45)0+(36+24)/+(56+35
3、)/ =570+60/+91/ =570+61/+31/ =580+1/+31/ =5801/31/,(2) 79045/ 61048/49/ 解:原式=79044/60/ 61048/49/ =780104/60/ 61048/49/ =(78 -61)0(104 -48)/(60-49)/ =17056/11/ (3)21031/27/3 解:原式=(213)0(313)/(273)/ =63093/81/ =63094/21/ =64034/21/,(4) 63021/39/3 解:原式=(633)0(213)/(393)/ =2107/13/ (5)10606/25/5 解:原式=(1065)0(65)/(255)/ =210(665)/ (255)/ =21013/(855)/ =21013/17/,今天你学到了些什么? 和你同伴交流一下!,