|a1'| |a11 a12| |a1| |k1||a2'|= |a21 a22| |a2| + |k2| ①|b1'| |a11 a12| |b1| |k1||b2'|= |a21 a22| |b2| + |k2| ②|c1'| |a11 a12| |c1| |k1||c2'|= |a21 a22| |c2| + |k2| ③解三个方程组,求a11,a12,a21,a22,k1,k2的值,对了再加分.谢谢(^o^)ly

等差数列中a11+a12为什么等于a1+a22 a1+a2=a a11+a12=b求a41+a42 Excel高手：选取一组数A1：A10,里面最接近A11的单元格并输出到A12! 等差数列中,a1+a12=10,则a2+a3+a10+a11等于 等比数列{an},a1*a12=5,求a8*a9*a10*a11=___. 等差数列a1+a2+a3=15,a1a2a3=80,则a11+a12+a13=? 在等差数列中若a1+a2+...+a10=65 a11+a12+...+a20=165则a1 的值? |a1'| |a11 a12| |a1| |k1||a2'|= |a21 a22| |a2| + |k2| ①|b1'| |a11 a12| |b1| |k1||b2'|= |a21 a22| |b2| + |k2| ②|c1'| |a11 a12| |c1| |k1||c2'|= |a21 a22| |c2| + |k2| ③解三个方程组,求a11,a12,a21,a22,k1,k2的值,对了再加分.谢谢(^o^)ly 等比数列{an}中,a1+a2+a3=30,a4+a5+a6==60,求a10+a11+a12.等比数列｛an｝中,a1+a2+a3=30,a4+a5+a6==60,求a10+a11+a12. 等差数列an中a1+a2+a3=32,a11+a12+a13=118.a4+a10为多少 设{an}是公差大于0的等差数列,若a1+a2+a3=80,则a11+a12+a13=? 求一道等差数列的题目!a1+a2+.+a5=30 a6+a7+.a10=80 求a11+a12+.a15 等比数列an中,若a1+a2+a3=30,a7+a8+a9=120,则a10+a11+a12 运筹学求解十二元一次不等式组,会lingo的进A11+A10+A7+A8≥60 A1+A12+A9+A10≥30 A2+A1+A10+A11≥30 A3+A2+A11+A12≥30 A4+A3+A12+A1≥70 A5+A4+A1+A2≥80 A12+A11+A8+A9≥40 A6+A5+A2+A3≥80 A7+A6+A3+A4≥80 A8+A7+A4+A5≥60 A9+A8+A5+A6 在等差数列AN中若A1+A6+A8+A10+A12=120,则A9-1/3A11=? 等比数列｛an｝中,a1+a2+a3=2,a4+a5+a6=4,则a10+a11+a12等于?过程,谢谢! 会整数规划和MATLAB的进A11+A10+A7+A8≥60 A1+A12+A9+A10≥30 A2+A1+A10+A11≥30 A3+A2+A11+A12≥30 A4+A3+A12+A1≥70 A5+A4+A1+A2≥80 A12+A11+A8+A9≥40 A6+A5+A2+A3≥80 A7+A6+A3+A4≥80 A8+A7+A4+A5≥60 A9+A8+A5+A6≥62 A10+A9+A6+A7≥70其 等比数列an中,a1+a2+a3=6,a4+a5+a6=18,则a10+a11+a12=?