Question

Tìm x y

2^x—1+5.2^x—2=

7

32

Bạn nào làm nhanh mìn h tích đúng

Answer 1

7

7

7

7

7

Answer 2

\(2^{x-1}+5.2^{x-2}=\frac{7}{32}\)

=>\(2^{x-2}\left(2+5\right)=\frac{7}{32}\)

=>\(2^{x-2}.7=\frac{7}{32}\)

=>\(2^{x-2}=\frac{7}{32}:7\)

=>\(2^{x-2}=\frac{1}{32}\)

=>\(2^{x-2}=2^{-5}\)

=>x-2=-5

=>x=-5+2

=>x=-3

Answer 3

haong thi bao ngoc