Question

[Lyzimi]

so sánh A =3³²-1;   B=(3+1).(3²+1).(3⁴+1).(3⁸+1).(3¹⁶+1)

Answer 1

[Minh Triều]

B=(3+1).(3²+1).(3⁴+1).(3⁸+1).(3¹⁶+1)

 =>2B=2.(3+1).(3²+1).(3⁴+1).(3⁸+1).(3¹⁶+1)

=(3-1)(3+1).(3²+1).(3⁴+1).(3⁸+1).(3¹⁶+1)

=(3²-1)(3²+1).(3⁴+1).(3⁸+1).(3¹⁶+1)

=(3⁴-1).(3⁴+1).(3⁸+1).(3¹⁶+1)

=(3⁸-1)(3⁸+1).(3¹⁶+1)

=(3¹⁶-1).(3¹⁶+1)

=3³²-1

=>A=\(\frac{3^{32}-1}{2}

Answer 2

[lê thế trung]

trong sách giải có bài này