高一物理题：把这六个公式推导一遍，要详细步骤！急求大神解答！！

S=1/2(a*t^2), S=1/2(a*（2t）^2), S=1/2(a*（3t）^2), ..., S=1/2(a*（nt）^2)显然 1: 2^2: 3^2: ...: n^2 3.S=1/2（a*t^2）-1/2（a*(t-1)^2）Tt=t^2-(t-1)^2=2t-1 Tt是等差数列 1,3,5,7,9...T1：T2：T3...=1:3:5...所以 S...