(3¹×3²×3³×....×3⁸⁰)÷(3¹×3³×3⁵×...×3¹¹¹) = ?
1+2+3+...+80=80*81/2=40*81=3240
1+3+5+...+111=(2*0+1)+(2*1+1)+(2*2+1)+...+(2*55+1)=2(1+2+....+55)+56*1=2*55*56/2+56=55*56+56=56*56=3136
(3¹×3²×3³×....×3⁸⁰)÷(3¹×3³×3⁵×...×3¹¹¹)=3¹⁺²⁺³⁺₋₋⁺⁸⁰÷3¹⁺³⁺⁵⁺⁻⁻⁺¹¹¹=3³²⁴⁰÷3³¹³⁶=3³²⁴⁰⁻³¹³⁶=3¹⁰⁴
