Question

a)5 mũ x =125

b)x mũ 3 =64

c)(x-1) mũ 2=25

d)5 mũ x +5 mũ x+2=130

Answer 1

a) 5^x = 125

5^x = 5³

=> x = 3

b) x³ = 64

x³ = 4³

=> x = 4

c) ( x - 1 ) ² = 25

( x - 1 ) ² = 5²

=> x - 1 = 5

=> x = 5 + 1

=> x = 6

d) 5^x + 5^x+2 = 130

5^x . 1 + 5^x . 5² = 130

5^x . ( 1 + 5² ) = 130

5^x . 26 = 130

5^x = 130 : 26

5^x = 5

=> x = 1

Answer 2

\(a.\)\(5^x=125\)

\(5^x=5^3\Rightarrow x=3\)

\(b.\)\(x^3=64\)

\(x^3=4^3\Rightarrow x=4\)

\(c.\)\(\left(x-1\right)^2=25\)

\(x^2=5^2\)mà \(\left(x-1\right)\)nên \(x=5+1=6\)

P/s: Ý d thiếu nhé bạn 

Answer 3

a)5^x=125

5^x=5³

=>x=3

b)tương tụ câu a

c)(x-1)²=25

(x-1)²=5²

=>x-1=5

x=5+1

x=6

d)thiếu đề!

Answer 4

Dễ dàng thôi bạn ạ!

a) 5^x=125

<=> 5^x=5³

<=> x=3 

b) x³=64

<=> x³=4³

<=> x=4

c) (x-1)²=25

<=> (x-1)²=5²

<=> x-1=5

<=> x=5+1

<=> x=6

d) 5^x+5^x+2=130

<=> 5^x.1+5^x.5²=130

<=> 5^x.(1+5²)=130

<=> 5^x.26=130

<=> 5^x=130:26

<=> 5^x=5

<=> 5^x=5¹

<=> x=1.