人教版五年级上册用式子表示天平平衡省名师优质课赛课获奖课件市赛课一等奖课件.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,本资料仅供参考，不能作为科学依据。谢谢。本资料仅供参考，不能作为科学依据。感谢,20,30,50,用式子表示天平平衡,20+30,=,50,1/11,20,？,100,20+,x,=,100,x,2/11,100,50,x,100,50,x,x,x,x,80,150,x,x,x,100,50,100,20,50,50,50,x,100,x,50+,x,=,100,50,+,2,x,100,80,2,x,3,x,=,150,100+20,100+50,100,+,2,x,50,3,20+,30,=,50,20+,x,=,100,50+,x,=,100,20+,30,=,50,20+,30,=,50,20+,x,=,100,20+,30,=,50,20+,x,=,100,20+,30,=,50,50+,x,=,100,20+,x,=,100,20+,30,=,50,50+,x,=,100,20+,x,=,100,20+,30,=,50,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,3,x,=,150,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,3,x,=,150,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,100+20,100+50,3,x,=,150,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,100+20,100+50,3,x,=,150,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,100,+,2,x,50,3,100+20,100+50,3,x,=,150,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,3/11,100,+,2,x,50,3,100+20,100+50,3,x,=,150,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,含有未知数式子,不含有未知数式子,4/11,100,+,2,x,50,3,100+20,100+50,3,x,=,150,80,2,x,50,+,2,x,100,50+,x,=,100,20+,x,=,100,20+,30,=,50,等 式,不 等 式,5/11,判断：是方程吗？,35,x=45,y+25,5,x+32=47,6(a+2),=42,35+65,=100,9b,3=60,x,+,y,=10,x,1472,0.49,x=7,3816+14,35,x=45,5,x+32=47,0.49,x=7,35,x=45,5,x+32=47,9b,3=60,0.49,x=7,35,x=45,5,x+32=47,35,x=45,5,x+32=47,9b,3=60,35,x=45,5,x+32=47,35+65,=100,9b,3=60,35,x=45,5,x+32=47,0.49,x=7,35+65,=100,9b,3=60,35,x=45,5,x+32=47,6/11,是方程吗？,6,x,+=78,36+=42,7/11,判断,1、“方程一定是等式，等式也一定是方程”这句话对吗？,2、你能用自己方式表示方程和等式之间关系吗？,8/11,100,+,2,x,50,3,80,2,x,100+20,100+50,50,+,2,x,100,50+,x,=,100,100-,20,=,80,20+,30,=,50,0.49,x=7,35+65,=100,9b,3=60,35,x=45,5,x+32=47,9/11,等 式,方程,方程一定是等式；但等式不一定是方程。,10/11,你会依据下面图列出方程吗？,9.5,12.5,a,x,x,x,3.5千克,240米,x,米,348米,a+9.5=12.5,240+x=348,3x=3.5,11/11,