一周角=2平角=4直角=3600一平角=1800一直角=90010=60/1/=60//（读成1度等于60分，1分等于60秒）例题1填空（1）34.50=0/（2）112.270=0///解：（1）34.50=340+0.50=340+0.5×60/=340+30/=34030/（2）112.270=1120+0.27×60/=1120+16.2/=1120+16/+0.2×60//=112016/12//3430112161210=60/1/=60//例题2把下列各题结果化成度(1)72036/(2)37014/24//解:(1)72036/=720+36/=720+(36÷60)0=720+0.60=72.60(2)37014/24//=370+14/+24//=370+14/+(24÷60)/=370+14/+0.4/=370+14.4/=370+(14.4÷60)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)//=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=(21×3)0(31×3)/(27×3)//=63093/81//=63094/21//=64034/21//(4)63021/39//÷3解:原式=(63÷3)0(21÷3)/(39÷3)//=2107/13//(5)10606/25//÷5解:原式=(106÷5)0(6÷5)/(25÷5)//=210(66÷5)/(25÷5)//=21013/(85÷5)//=21013/17//
