Question

a) So sánh 2²⁰¹⁵ và 3¹⁰²⁹

b) Tính A = \(\frac{1}{4.9}+\frac{1}{9.14}+\frac{1}{14.19}+...+\frac{1}{64.69}\)

Answer 1

a 2^2015>3^1029

b 5A=\(\frac{5}{4.9}\)+\(\frac{5}{9.14}\)+\(\frac{5}{14.19}\)+.....+\(\frac{5}{64.69}\)

 5A=1/4-1/9+1/9-1/14+1/14-1/19+1/19+....+1/64-1/69

5A=1/4-1/9

A=(1/4-1/9)/5

A=1/36

Answer 2

kho lam bo tay

Answer 3

khó lắm bạn ơi

Answer 4

kho lam ban a

Answer 5

a)2^2015 > 3^1029

b)325/276

Answer 6

A=\(\frac{1}{5}\cdot\left(\frac{1}{4}-\frac{1}{9}+\frac{1}{9}-\frac{1}{14}+\frac{1}{14}-\frac{1}{19}+...+\frac{1}{64}-\frac{1}{69}\right)\)
A=\(\frac{1}{5}\cdot\left(\frac{1}{4}-\frac{1}{69}\right)=\frac{1}{5}\cdot\frac{65}{276}=\frac{13}{276}\)