《加减法的简便计算》教学课件1

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,*,+,-,+,-,-,加减法的简便计算,234,-,66,-,34,在没有括号的算式里，如果只有加、减法，要从左往右按顺序计算。,=168,-,34,=134,（页）,234,-,66,-,34,一个数连续减去几个数等于减去这后两个数的和。,=234,-(,66,+,34,),=234,-,100,=134,（页）,234,-,66,-,34,=234,-,34,-,66,=200,-,66,=134,（页）,射击游戏,看看哪个方法最好,.,800,138,162,（）,A,800,138,162,=662,162,=500,B,800,138,162,=800,（,138,162,）,=800,300,=500,看看哪个方法最好,.,472,49,272,（）,A,B,472,49,272,=472,（,49,272,）,=472,321,=151,472,49,272,=472,272,49,=200,49,=151,射击游戏,427,73,127,=427,(127,73),=427,200,=227 (),144,56,44,=144,(56,44),=144,100,=44 (),144,56,44,=,88,44,=132,在 和,_,上填相应的运算符号和数：,868,-,52,-,48,868 (52+_),1500,-,28,-,272=_,-,(28 272),415,-,74,-,26=_,(_ _),48,1500,+,415,74,+,26,计算下面各题，怎样简便就怎样计算。,528,-,53,-,47,470,-,254,-,46,545,-,167,-,145,325,276,24,325,(276,24),325,300,25,（票）,25,2000,416,284,2000,（,416,284,）,2000,700,1300,（米）,