等差数列 A1+A2+A3=6,A2+A3+A4=7,A3+A4+A5=

等差数列 A1+A2+A3=6,A2+A3+A4=7,A3+A4+A5= 设|A|是三阶矩阵,A=(a1,a2,a3)则|A|=?A.|a1-a2,a2-a3,a3-a1| B.|a1-a2,a2-a3,a3-a1|C.|a1+2a2,a3,a1+a2| D.|a1-a3,a2+a3,a1+a2| 等差数列{an},a1+a2+a3=12,a2= 等差数列a1+a2+a3=-15.a3+a4=-16 1.已知等差数列｛an｝中,a1*a2*a3=8,a1+a2+a3=6,求an为多少222 等差数列中a1+a2+a3+a4+a5=3,a1*a1+a2*a2+a3*a3+a4*a4+a5*a5=12求a1-a2+a3-a4+a5 已知数列a1,a2,a3为等差数列,数列a2,a3,a4为等比数列,且a1+a4=16,a2+a3=12,求a1,a2,a3,a4=? 已知数列a1,a2,a3为等比数列,数列a2,a3,a4为等差数列,且a1+a4=16,a2+a3=12,求a1,a2,a3,a4=? 等差数列中：a1+a2+a3+...+a100=0 则有 A.a1+a101>0 B.a2+a100 已知等差数列{an}满足a1+a2+a3+...+a11=0,则有A、a1+a11>0B、a2+a10 设a1,a2,a3为正数,求证a1*a2/a3+a2*a3/a1+a3*a1/a2>=a1+a2+a3 已知向量组a1,a2,a3线性无关,则下列向量组中线性无关的是 Aa1,3a3,a1,-2a2 Ba1+a2,a2-a3,a3-a1-2aA：a1,3a3,a1,-2a2 B：a1+a2,a2-a3,a3-a1-2a C：a1,a3+a1,a3-a1 D:a2-a3,a2=a3,a2 如果a1、a2、a3、a4成等差数列且a1*a2=-32/3,a2*a3=-24,求a4=? 等差数列{a小n}中,a1加a2加a3=9,a1乘a2乘a3=15,则a1=?a小n=?急 等差数列中若a1+a2+a3+a4+a5=20,a3=?a2+a4=? 等差数列a3+a4+a5=12,求a1+a2+a7 等差数列中,a1=a-1,a2=a+1,a3=a+3,求an 设a1,a2,a3均为三维向量,3阶方阵A=（a1,a2,a3）,则|a1-a2,a3-a2,a3-a1|=