人教版七年级数学上册4.3.3角度的换算课件
ppt
2022-09-20 13:02:01
13页
欢迎来到数学课堂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=90010=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+0.5×60/=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//今天你学到了些什么?和你同伴交流一下!祝同学们学习愉快