在线等y=a1.*exp(-sqrt((a2-lab)^2/a5 (a3-cap)^2/a6 (a4-xin)^2/a7

在等差数列{a}中,a1+a10=2,求a1-a2+a3-a4+a5+a6-a7+a8-a9+a10 A1+A3+A5+A7=4,求A2+A4+A6 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? 在等比数列﹛an﹜中,a1+a2=1,a3+a4=2,则a5+a6+a7+a8= a2*a6=4,求a1*a2*a3*a4*a5*a6*a7 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 若集合A={a1,a2,a3,a4,a5,a6｝,B={a1^2,a2^2,a3^2,a4^2,a5^2,a6^2},其 已知一列数a1,a2,a3,a4,a5,a6,a7,且a1=1,a7=729,a1/a2=a2/a3=a3/a4=a4/ 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=? a1=1 a2=2 a3=4 a4=7 a5=11 a6=16 a7=22