Question

2^ n +1=128

2n-15=17

2.3^n=162

(7^n-11)^3=2^5.5^2+200 

Answer 1

câu a đề sai

2n-15=17

=> 2n=17+15

=>2n=32

=> n=5

c,\(2.3^n=162=>3^n=162:2=>3^n=81\)

=>\(n=4\)

Answer 2

d, (7n-11)^3=2^5.5^2+200 = (7n-11)^3=32.25+200

= (7n-11)^3=800 +200 = 1000

câu này đè sai