1800: [(5x+130): x] = 100

(5x+130):x=18

5+130:x=18

130:x=13

x=10

8² : 8⁴ hay 8⁴ : 8² hả bạn?

a: =>(x-28):12=1/64

=>x-28=12/64=3/16

=>x=451/16

c: =>18:[(5x+130):x]=1

=>(5x+130):x=18

=>5x+130=18x

=>13x=130

hay x=10

=10 ĐÓ PN

5X-130=25

5X      =25+130

5X      =155

X        =155:5

X        =31

\(5x-130=25\)

\(\Rightarrow5x=25+130\)

\(\Rightarrow5x=155\)

\(\Rightarrow x=155:5\)

\(\Rightarrow x=31\)

5x - 130 = 25

    5x      = 25 + 130

    5x       =   155

      x        =   155 : 5

      x        =      31

5x+130=100x+40

5x-100x=40-130

-95x=-90

x=18/19

5x + 130 = 100x + 40

<=> 5x - 100x = 40 - 130

<=> -95x = -90

<=> 95x  = 90

<=>     x = \(\frac{90}{95}\)

<=>    x = \(\frac{18}{19}\)

\(5x+130=100x+40\)

\(100x-5x=130-40\)

\(95x=90\)

\(x=\frac{90}{95}\)

\(x=\frac{18}{19}\)

Vậy \(x=\frac{18}{19}\)

Tham khảo nhé

\(5^{x+1}+5^{x-1}=130\)

\(5^x\cdot5^1+5^x\div5^1=130\)

\(5^x\cdot5^1+5^x\cdot\dfrac{1}{5}=130\)

\(5^x\cdot\left(5+\dfrac{1}{5}\right)=130\)

\(5^x\cdot\dfrac{26}{5}=130\)

\(5^x=130\div\dfrac{26}{5}\)

\(5^x=130\cdot\dfrac{5}{26}\)

\(5^x=25\)

\(\Rightarrow5^x=5^2\)

\(\Rightarrow x=2\)

Mọi người còn câu trả lời nào khác không cứ trả lời đi mik tick cho

5^x+1.5^x-1=130

5^x-1.5²+5^x-1.1=130

5^x-1.(5²+1)=130

5^x-1.(25+1)=130

5^x-1.26=130

5^x-1=130:26

5^x-1=5¹

^{=> x-1=1}

^x=1+1

^x=2

^{Tick cho mình nha}