Question

[ho nguyen thao vy]

tim so tu nhien x biet 

(2.x+1)mu 5 /(2.n+1)mu 2=1

2 mũ x+2 .2 mu x+........+10.2 mu x =10 . 11

dau / nay la dau chia

dau . nay la nhan do nhe!!!!

Answer 1

[ghost river]

( 2x + 1 )⁵ : ( 2x + 1 )² = 1
\(\Rightarrow\)( 2x+ 1 )³ = 1 = 1³ 
\(\Rightarrow\)2x + 1 = 1
\(\Rightarrow\)2x = 0
\(\Rightarrow\)x = 0
2^x + 2 . 2^x + ... + 10 . 2^x= 10 . 11
\(\Rightarrow\)2^x . ( 1 + 2 + 3 + ... + 9 + 10 ) = 110
\(\Rightarrow\)2^x . 55 = 110
\(\Rightarrow\)2^x = 110 : 55
\(\Rightarrow\)2^x = 2
\(\Rightarrow\)x = 1