4+8+12+16+20+ +400要简便还有过程谢谢!
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 02:47:56
![4+8+12+16+20+ +400要简便还有过程谢谢!](/uploads/image/z/2713205-29-5.jpg?t=4%2B8%2B12%2B16%2B20%2B+%2B400%E8%A6%81%E7%AE%80%E4%BE%BF%E8%BF%98%E6%9C%89%E8%BF%87%E7%A8%8B%E8%B0%A2%E8%B0%A2%21)
4+8+12+16+20+ +400要简便还有过程谢谢!
4+8+12+16+20+ +400要简便还有过程谢谢!
4+8+12+16+20+ +400要简便还有过程谢谢!
4+8+12+16+20+400
=(4+16)+(8+12)+(20+400)
=20+20+420
=460
(4+100)*50=5200
20200. 1+2+3+..+100的4倍=5050*4=20200
4+8+12+16+20+400=(4+16)+(8+12)+20+400=20+20+20+400=460
4*1+4*2+4*3.....+4*100=4*(1+100)=4*5050=20200
4*(1+2+3+ +100)=4*5050=20200
4+8+12+16+20+ +400
=(4+400)*100/2
=404*50
=20200