a2+a3+a4+a5=a2+a2+d+a2+2d+a2+3d=4a2+6d=34 →2a2+3d=17 →3d=17-2a2
a2a5=a2(a2+3d)=52 →a2(a2+17-2a2)=52
解得a2=4或13 →d=3或-3
自己算a5吧
在等差数列{an}中:若a2+a3+a4+a5=34,a2●a5=52,求a5的值.
在等差数列{an}中:若a2+a3+a4+a5=34,a2●a5=52,求a5的值.
数学人气：678 ℃时间：2019-10-19 04:59:56
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