Question

关于∑∑的问题

4 15
∑ ∑Cell（i ，j）
i=1 j=1
求助求助，这个要怎么计算？

Answer 1

原式 = ∑<i=1,4> [Ceu(i, 1) + Ceu(i, 2) + ...... + Ceu(i, 15)]
= [Ceu(1, 1) + Ceu(1, 2) + ...... + Ceu(1, 15)]
+ [Ceu(2, 1) + Ceu(2, 2) + ...... + Ceu(2, 15)]
+ [Ceu(3, 1) + Ceu(3, 2) + ...... + Ceu(3, 15)]
+ [Ceu(4, 1) + Ceu(4, 2) + ...... + Ceu(4, 15)]