题目

     With the widespread use of technologies like GPS and Intemet-connected cameras, parents can now keep an eye on their children wherever they are.      The combination of high-tech tools and highly-protective parents has set off the creation of a GPS-equipped wristwatch that allows parents to listen in real time to what their children are doing. The device has caused complaints from teachers since some parents began equipping their children with the watch so they can listen in on what happens at school.      A teacher surnamed You at a well-known primary school in Pudong如图，给出了一个三角形数阵，已知每一列的数成等差数列，从第3行起，每一行的数成等比数列，每一行的公比都相等．记第i行第j列的数为aij（i≥j，i，j∈N*）（I）求a43；    （Ⅱ）写出aij；（Ⅲ）设这个数阵共有n行，求数阵中所有数之和．