数列{an} 满足a(n+1)+(-1)^nan=2n-1,{an} 的前6项和为

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数列{an}满足a(n+1)+(-1)^nan=2n-1,{an}的前6项和为数列{an}满足a(n+1)+(-1)^nan=2n-1,{an}的前6项和为数列{an}满足a(n+1)+(-1)^na

数列{an} 满足a(n+1)+(-1)^nan=2n-1,{an} 的前6项和为
数列{an} 满足a(n+1)+(-1)^nan=2n-1,{an} 的前6项和为

数列{an} 满足a(n+1)+(-1)^nan=2n-1,{an} 的前6项和为
a2-a1=1,a3+a2=3,a4-a3=5,a5+a4=7,a6-a5=9,
a1+a2+...+a6=a1+(a2+a3)+(a4+a5)+a6=10+a1+a6
将a1-a2=-1,a3+a2=3,a4-a3=5,a5+a4=7,a6-a5=9相加得a1+a6=23,故前6项和为33.

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