Question

Tính nhanh:

A=1+3+3^2+3^3+3^4

B=(3^2+1)×(3^4+1)×(3^8+1)

 

 

Tính hộ e cái.Đang vội

Answer 1

A=1+3+3^2+3^3+3^4

=1+3+9+27+81

=(9+81)+(3+27)+1

=90+30+1

=121

B=(3^2+1)×(3^4+1)×(3^8+1)

=(9+1)×(81+1)×(6561+1)

=10x82x6562

=820x6562

=5380840

Answer 2

A =1+3+3²+3³+3⁴

3A =3+3²+3³+3⁵

3A-A=3⁵-1

2A =243-1

A=242:2

A=121