Question

 a      (2x - 6) . (3x - 18) = 0

  b      5x + 73 . 21 = 73 . 26

c        2x - 12 - x =0

Answer 1

a) \(\left(2x-6\right)\left(3x-18\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}2x-6=0\\3x-18=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=3\\x=6\end{cases}}\)

b) \(5x+73.21=73.26\)

\(\Leftrightarrow5x=73.5\)

\(\Rightarrow x=73\)

c) \(2x-12-x=0\)

\(\Rightarrow x=12\)

Answer 2

nhanh giúp mình nha

Answer 3

a) \(\left(2x-6\right)\left(3x-18\right)=0\Leftrightarrow\orbr{\begin{cases}2x-6=0\Leftrightarrow x=3\\3x-18=0\Leftrightarrow x=6\end{cases}}\)

b) \(5x+73.21=73.26\Leftrightarrow5x+73.21=5.75+73.21\Leftrightarrow x=5\)

b) \(2x-12-x=0\Leftrightarrow2x-x=x=12\)

Answer 4

Sorry kq phần b bằng 73 nha

Answer 5

a) (2x - 6) (3x - 18) = 0

=> 2x - 6 = 0 hoặc 3x - 18 = 0

=> 2x = 6 hoặc 3x = 18

=> x = 3 hoặc x = 6

Vậy x thuộc {3 ; 6}.

b) 5x + 73 . 21 = 73 . 26

5x + 1533 = 1898

5x = 1898 - 1533

5x = 365

x = 73

Vậy x = 73.

c) 2x - 12 - x = 0

2x - x - 12 = 0

x - 12 = 0

x = 12

Vậy x = 12.