10+20+30+40+50+60+70+80+90+100=?为什么?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 20:43:00
![10+20+30+40+50+60+70+80+90+100=?为什么?](/uploads/image/z/190674-18-4.jpg?t=10%2B20%2B30%2B40%2B50%2B60%2B70%2B80%2B90%2B100%3D%3F%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
10+20+30+40+50+60+70+80+90+100=?为什么?
10+20+30+40+50+60+70+80+90+100=?为什么?
10+20+30+40+50+60+70+80+90+100=?为什么?
10+20+30+40+50+60+70+80+90+100
=(10+100)*10/2
=110*5
=550
550
用(100+10)*5=550
=10+90+20+80+30+70+60+40+100+50
=5*100+50
=550