Question

Tìm x:

a, 5 mũ x+2 = 125

b, | x+3 | - 2/3 = 1

Answer 1

\(5^{x+2}=125\Rightarrow5^x.5^2=125\Rightarrow5^x=125:5^2\Rightarrow5^x=5\Rightarrow5^x=5^1\Rightarrow x=1\)

\(\left|x+3\right|-\frac{1}{3}=1\)

\(\Rightarrow\left|x+3\right|=\frac{1}{3}\)

\(\Rightarrow\begin{cases}x+3=\frac{1}{3}\\x+3=-\frac{1}{3}\end{cases}\)

\(\Rightarrow\begin{cases}x=-\frac{8}{3}\\x=-\frac{10}{3}\end{cases}\)

Answer 2

a) 5^x+2 = 125

=> 5^x+2 = 5²

=> x + 2 = 2

=> x = 2 - 2

=> x = 0

b) \(\left|x+3\right|-\frac{2}{3}=1\)

=> \(\left|x+3\right|=1+\frac{2}{3}\)

=> \(\left|x+3\right|=\frac{5}{3}\)

=> \(\left[\begin{array}{nghiempt}x+3=\frac{5}{3}\\x+3=-\frac{5}{3}\end{array}\right.\)=> \(\left[\begin{array}{nghiempt}x=-\frac{4}{3}\\x=-\frac{14}{3}\end{array}\right.\)

Answer 3

câu 2) của  soyeon_Tiểubàng giải đúng đó

Answer 4

đề 0 rõ ràng