a1=1 a2=2 a3=4 a4=7 a5=11 a6=16 a7=22
A1+A3+A5+A7=4,求A2+A4+A6
a2*a6=4,求a1*a2*a3*a4*a5*a6*a7
已知一列数a1,a2,a3,a4,a5,a6,a7,且a1=1,a7=729,a1/a2=a2/a3=a3/a4=a4/
a1=1 a2=2 a3=4 a4=7 a5=11 a6=16 a7=22
a1=8,a7=5832,a1/a2=a2/a3=a3/a4=a4/a5=a5/a6=a6/a7,求a5的值
已知集合A={a1,a2,a3,a4,a5,a6,a7},A并上B={a1,a2,a3,a4,a5,a6,a7,.,a1
(1)a1+a2+a3=30 a4+a5+a6=80 则a7+a8+a9=?
an=(-1)的n次方+1,求a1+a2+a3+a4+a5+a6+a7+a8
已知集合A={a1,a2,a3,a4,a5,a6,a7},A∪B={a1,a2,a3,a4,a5,a6,a7.,a100
等比数列,a1+a2+a3=6,a2+a3+a4=3,求a3+a4+a5+a6+a7+a8=?
1 A4+A7=8求A2+A3+A4+A5+A6+A7+A8=
等比数列{an}中,已知a1+a2+a3=4,a2+a3+a4=-2,则a3+a4+a5+a6+a7+a8等于多少?