已知a2+a3=2 a3+a4=3 ·······a98+a99=98 和 a1+a100=100
求a1+a2+a3+a4+a5``````````````````a98+a99+a100的值 具体解答过程
已知a2+a3=2 a3+a4=3 ·······a98+a99=98 和 a1+a100=100
求a1+a2+a3+a4+a5``````````````````a98+a99+a100的值 具体解答过程
a1+a2+a3+a4+a5+``````````````````+a98+a99+a100=a1+a100+a2+a3+a3+a4·······a98+a99-(a3+a4=3 ·······+a97+a98)=2+3+.....+98+100-(3+4+....+97)=1+2+3+...+99-3-4-...-97
=1+2+98+99=200