Question

负三的2N次方乘负三分之一的2N加一次方减二乘负一的2N加一次方

Answer 1

(-3)^(2n)*(-1/3)^(2n1+1)-2*(-1)^(2n+1)

=3^(2n)*(1/3)^(2n)*(-1/3)-2*(-1)

=(3*1/3)^(2n)*(-1/3)+2

=1^(2n)*--1/3)=2

=-1/3+2

=5/3