3^2m+3n-1=(3^m)²×(3^n)³÷3=25×8÷3=200/3
3^n=2, 3^m=5 3^2m+3n-1=(3^m)²*(3^n)³÷3=25x8÷3=200/3
3^(2m＋3n－1)=[3^m]²×[2^n]³÷3=5²×2³÷3=200/3
“^”这个是什么呀？？
