118,24 - (x:5+x.3)= 54,24

x:5 + x.3 = 118,24 - 54,24 = 64

1/5 x + 15/5 x = 64 

16/5 x = 64 

x = 64 : 16/5 = 20

118,24 - ( x : 5 - x x 3 ) = 27,12 x 2

118,24 - ( x : 5 - x x 3 ) = 54,24

x : 5 - x x 3 = 118,24 - 54,24

x : 5 - x x 3 = 64

1/5x + 15/5x = 64

16/5x = 64

x = 64 : 16/5 = 20 = > x = 20

\(118,24-\left(x:5+x.3\right)=27,12.2\)

\(\Leftrightarrow118,24-\left(x:5+x.3\right)=54,24\)

\(\Leftrightarrow x:5+x.3=118,24-54,24\)

\(\Leftrightarrow x.\frac{1}{5}+x.3=64\)

\(\Leftrightarrow x.\left(\frac{1}{5}+3\right)=64\)

\(\Leftrightarrow x.\frac{16}{5}=64\)

\(\Leftrightarrow x=64:\frac{16}{5}\)

\(\Leftrightarrow x=20\)

118,24 - ( X : 5 + X x 3 ) = 27.12 x 2 

=> X : 5   +   X x 3   =  118,24 -  54,24

=>  X x 1/5  + X x 3 =  64

=> X x ( 1 / 5  + 3 ) = 64

=>  X x 16/5 = 64

=> X           =  20

  vậy X = 20

118,24 - ( X : 5 + X x 3 ) = 27,12 x 2

118,24 - ( x : 5 + X x 3 ) = 54,24

X : 5 +  X x 3 = 118,24 - 54,24

X : 5 + X x 3 = 64

X x 1/5 + X x 3 = 64

X x ( 1/5 + 3 ) = 64

X x 3,2   =  64

X = 64 : 3,2

X = 20

~Hok tốt~

K nhoa ~~

Bài 1:

a) 2^{x + 1} - 2^x = 32

2^{x + 1} - 2^x =  2⁵ 

=> x + 1 - x = 5

=> x = 5

a) 2^x+1 - 2^x = 32

   2^x . 2 - 2^x . 1 = 32

   2^x . (2 - 1)     = 32

   2^x . 1            = 32 

   2^x                = 32 : 1

   2^x                = 32

   2^x                = 2⁵

Suy ra : x = 5

    \(\dfrac{20\times25\times7\times8}{75\times8\times12\times14}\)

=   \(\dfrac{4\times5\times25\times7\times8}{3\times25\times8\times3\times4\times2\times7}\)

= \(\dfrac{25\times7\times8\times4\times5}{25\times7\times8\times4\times2\times3\times3}\)

= \(\dfrac{25\times7\times8\times4}{25\times7\times8\times4}\) x \(\dfrac{5}{2\times3\times3}\)

= 1 x \(\dfrac{5}{18}\)

= \(\dfrac{5}{18}\)

\(=\dfrac{5.4.5.5.7.8}{5.3.5.8.7.4}\)

Triệt tiêu những phần giống nhau của cả tử và mẫu ta có: 

\(=\dfrac{5}{3}\)