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

(5x+130):x=18

5+130:x=18

130:x=13

x=10

Giúp mình nhé !

cảm ơn các bạn !

a, \(x:\left[\left(1800+600\right):30\right]=560:\left(315-35\right)\)

\(\Rightarrow\) \(x:\left[2400:30\right]=560:280\)

\(\Rightarrow\) \(x:80=2\)

\(\Rightarrow\) \(x=160\)

b, \(\left[\left(250-25\right):15\right]:x=\left(450-60\right):130\)

\(\Rightarrow\) \(\left[225:15\right]:x=390:130\)

\(\Rightarrow\) \(15:x=3\)

\(\Rightarrow\) \(x=5\)

a) x = 160

b) x = 5

c) x = 107

d) x = 3

toi khong biet

b. 53.39 +47.39 – 53.21 – 47.21.

=53.(39-21)+47.(39-21)

=(39-21).(53+47)

=18.100

=1800

X^100=(x^50)^2

x thuộc Z

cần ghi cách làm k

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

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

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

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

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

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

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

\(5^x=25\)

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

\(\Rightarrow x=2\)

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

264+12x=1800

12x=1536

x=128

(x+73):19=321

x+73=6099

x=6026

2x+3x+4x=18

9x=18

x=2

10<2x<20

=>5<x<10

x=6,7,8,9

\(264+12x=1800\)

\(\Leftrightarrow12x=1536\)

\(\Leftrightarrow x=128\)

==============

\(\left(x+73\right):19=321\)

\(\Leftrightarrow x+73=6099\)

\(\Leftrightarrow x=6026\)

===============

\(2x+3x+4x=18\)

\(\Leftrightarrow x.\left(2+3+4\right)=18\)

\(\Leftrightarrow x.9=18\)

\(\Leftrightarrow x=2\)

================

\(10< 2x< 20\)

..................................

\(2x=12\Leftrightarrow x=6\)

\(2x=14\Leftrightarrow x=7\)

\(2x=16\Leftrightarrow x=8\)

\(2x=18\Leftrightarrow x=9\)

\(x\in\left\{6;7;8;9\right\}\)