130 = 13 . 5 . 2

=> Ư (1 , 2 , 5 , 10 , 26 , 65 130)

Vậy ước của 130 thuộc {1 , 2 , 5 , 10 , 26 , 65, 130}

\(5B=5^2+5^3+5^4+...+5^{2023}\)

\(4B=5B-B=5^{2023}-5\)

\(\Rightarrow4B+5=5^{2023}=5^{x-1}\)

\(\Rightarrow x-1=2023\Rightarrow x=2024\)

3³. 18 - 3³. 12

= 3³. ( 18 - 12 )

= 3³. 6

= 27. 6

= 162

   3³.18-3³.12

= 27.18-27.12

= 27.(18-12)

= 27.     6

=    162

\(\left(-2\right)+4+\left(-6\right)+26\)

\(=2-6+26\)

\(=-4+26\)

\(=22\)

( -2 ) + 4 + ( -6 ) + 26

= -2 + 4 - 6 + 26

= 22

5. 4² - 18 : 3²

= 5. 16 - 18 : 9

= 80 - 2

= 78

5. 42 - 18 : 32

= 5. 16 - 18 : 9

= 80 - 2

= 78    

6. ( x + 2³ ) + 40 = 100

6. ( x + 2³ )  = 60

x + 2³ = 10

x + 8 = 10

x = 2

6. ( x + 23 ) + 40 = 100

6. ( x + 23 )  = 100 - 40

6. ( x + 23 )  =  60

      x + 2³    = 60/6

      x + 23     = 10

      x + 8     = 10

      x           = 10 - 8

      x           = 2

\(2^2.\left(x+3^2\right)-5=55\)

\(\Rightarrow4.\left(x+9\right)-5=55\)

\(\Rightarrow4.\left(x+9\right)=55+5\)

\(\Rightarrow4.\left(x+9\right)=60\)

\(\Rightarrow x+9=60:4\)

\(\Rightarrow x+9=15\)

\(\Rightarrow x=15-9\)

\(\Rightarrow x=6\)

\(155-10\left(x+1\right)=55\)

\(\Rightarrow10\left(x+1\right)=155-55\)

\(\Rightarrow10\left(x+1\right)=100\)

\(\Rightarrow x+1=100:10\)

\(\Rightarrow x+1=10\)

\(\Rightarrow x=10-1\)

\(\Rightarrow x=9\)