Question

va rog sa ma ajutati .cl 5​

Answer 1

2+2•3+2•3²+2•3³+…..+2•3²⁰¹²=x•81⁵⁰³-1

2(1+3+3²+3³+…..+3²⁰¹²=x•(3⁴)⁵⁰³-1

2(3²⁰¹³-1)/2=x•3²⁰¹²-1

3²⁰¹³-1=x•3²⁰¹²-1

3²⁰¹³=x•3²⁰¹²

=>x=3