100=2×2×5×5=(3n)^2*(3m)^=81m^2n^2已知3的m次方=5,3的n次方=2，试用含m，n的代数式表示100=？3的m次方=5,3的n次方=2.100=2×2×5×5=(3n)^2*(3m)^2=81m^2n^2