脱式计算,能简算简算
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/07/05 02:45:05
脱式计算,能简算简算
![](http://img.wesiedu.com/upload/3/1e/31e33172575c7039901000956c227d4e.jpg)
![](http://img.wesiedu.com/upload/3/1e/31e33172575c7039901000956c227d4e.jpg)
![脱式计算,能简算简算](/uploads/image/z/7434269-53-9.jpg?t=%E8%84%B1%E5%BC%8F%E8%AE%A1%E7%AE%97%2C%E8%83%BD%E7%AE%80%E7%AE%97%E7%AE%80%E7%AE%97)
100-99+98-97+...+6-5+4-3+2-1
=(100-99)+(98-97)+(96-95)+……+(6-5)+(4-3)+(2-1)
=1×50
=50
1/2+1/6+1/12+1/20+1/30+.+1/72+1/90
= 1/1*2 +1/2*3 +1/3*4 +...+1/8*9 +1/9*10
= (1/1 -1/2)+(1/2 -1/3)+...+(1/8 -1/9)+(1/9 -1/10)
= 1/1 -1/10
= 9/10
很高兴能帮到你,如果觉得好请选为满意答案 ,祝你学习进步 (*^__^*)
=(100-99)+(98-97)+(96-95)+……+(6-5)+(4-3)+(2-1)
=1×50
=50
1/2+1/6+1/12+1/20+1/30+.+1/72+1/90
= 1/1*2 +1/2*3 +1/3*4 +...+1/8*9 +1/9*10
= (1/1 -1/2)+(1/2 -1/3)+...+(1/8 -1/9)+(1/9 -1/10)
= 1/1 -1/10
= 9/10
很高兴能帮到你,如果觉得好请选为满意答案 ,祝你学习进步 (*^__^*)