1*2+2*3+3*4+4*5.99*100+100*101
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/19 13:34:34
1*2+2*3+3*4+4*5.99*100+100*101
![1*2+2*3+3*4+4*5.99*100+100*101](/uploads/image/z/4284530-26-0.jpg?t=1%2A2%2B2%2A3%2B3%2A4%2B4%2A5.99%2A100%2B100%2A101)
=1^2+2^2+3^2+.+100^2+1+2+3+.+100
=1/6*100*(100+1)*(2*100+1)+1/2*100*(100+1)
=338350+5050
=343400
=1/6*100*(100+1)*(2*100+1)+1/2*100*(100+1)
=338350+5050
=343400
1*2+2*3+3*4+4*5.99*100+100*101
1+1+2+2+3+3+4+4+5+5.99+99+100+100=?
1*1-2*2+3*3-4*4+...+99*99-100*100+101*101
1 2 3 .99 100 2 3 4 .100 101 3 4 5 .101 102 .100 101 102 .19
1,2,3,...,99,100; 2,3,4,...,100,101; 4,5,6,...,101,102;...10
1/2+1/3+2/3+4/1+2/4+3/4+.+1/101+1/101+.100/101=?
1/1*2*3+1/2*3*4+1/3*4*5+...+1/99*100*101
1/1*2*3+1/2*3*4+1/3*4*5+.1/99*100*101
1/2*2/3*3*4*4/5*.*99/100*100/101=
1/1*2*3+1/2*3*4+1/3*4*5.1/99*100*101
1-2+3-4+5...+99-100+101=?
1-2+3-4+5-6+...+99-100+101求值