\(25\ge5^x\ge125\)

\(5^2\ge5^x\ge5^3\)

\(2\ge x\ge3\)

x = 3 hoặc x = 2

mk mới học lớp 6

bạn có thể trả lời giúp mình câu hỏi này ko?

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

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

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

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

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

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

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

P/s: Ý d thiếu nhé bạn 

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!

a) 4.25-12.5+170:10

=100-60+17

=40+17

=57

b) (7+3³:3²).4-3

=(7+3).4-3

=10.4-3

=40-3

=37

c) 12:{400:[500-(125+25.7)]}

=12:{400:[500-(125+175)]}

=12:{400:[500-300]}

=12:{400:200}

=12:2

=6

d) 168+{[2.(2⁴+3²)-256⁰]:7²}

=168+{[2.(16+9)-1]:49}

=168+{[2.25-1]:49}

=168+{[50-1]:49}

=168+{49:49}

=168+1

=169

a) 5³⁶ = 5¹² (5³)¹² = 125¹²; 11²⁴ = 11^2.12 = (11²)¹² = 121¹²

a: \(4^5\cdot8^7=2^{10}\cdot2^{21}=2^{31}\)

b: \(125^5\cdot25^3=5^{15}\cdot5^6=5^{21}\)

a) \(4^5\)x \(8^7\)

= \(\left(2^2\right)^5\) x \(\left(2^3\right)^7\)

= \(2^{10}\) x \(2^{21}\)

= \(2^{31}\)

b) \(125^5\) x \(25^3\)

= \(\left(5^3\right)^5\) x \(\left(5^2\right)^3\)

= \(5^{15}\) x \(5^6\)

= \(5^{21}\)

\(\Leftrightarrow5^{2x}\cdot5^{-1}=125=5^3\)

=>2x-1=3

hay x=2

mk not biết

a, (-0,2)² \(\times\) 5 - \(\dfrac{2^{13}\times27^3}{4^6\times9^5}\)

= 0,04 \(\times\) 5 - \(\dfrac{2^{13}\times3^9}{2^{12}\times3^{10}}\)

= 0,2 - \(\dfrac{2}{3}\)

= \(\dfrac{2}{10}\) - \(\dfrac{2}{3}\)

=  - \(\dfrac{7}{15}\)

b, \(\dfrac{5^6+2^2.25^3+2^3.125^2}{26.5^6}\)

 = \(\dfrac{5^6+4.5^6+8.5^6}{26.5^6}\)

= \(\dfrac{5^6.\left(1+4+8\right)}{26.5^6}\)

= \(\dfrac{1}{2}\)

a, (-0,2)2 $\times$ 5 - 213×27346×9546×95213×273​

= 0,04 $\times$ 5 - 213×39212×310212×310213×39​

= 0,2 - 2332​

= 210102​ - 2332​

=  - 715157​

b, 56+22.253+23.125226.5626.5656+22.253+23.1252​

 = 56+4.56+8.5626.5626.5656+4.56+8.56​

= 56.(1+4+8)26.5626.5656.(1+4+8)​

= 1221​