Question

Tim x biet:

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

B)25+(15-x)=30

Answer 1

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

=> 2x.6 = 0 => 12x = 0 => x = 0

3x - 18 = 0 => 3x = 18 => x = 6

KL:...

b) 25 + (15-x) = 30

25 + 15 - x = 30

40 - x = 30

x = 10

Answer 2

\(a)\left(2x.6\right).\left(3x-18\right)=0\Leftrightarrow\hept{\begin{cases}2x.6=0\\3x-18=0\end{cases}\Leftrightarrow\hept{\begin{cases}12x=0\\3x=18\end{cases}\Leftrightarrow}\hept{\begin{cases}x=0\\x=6\end{cases}}}\)

\(b)25+\left(15-x\right)=30\Leftrightarrow15-x=5\Leftrightarrow x=20\)

tym cho mk nha

Answer 3

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

<=> \(12x.\left(3x-18\right)=0\)

<=> \(\hept{\begin{cases}12x=0\\3x-8=0\end{cases}}\)

<=> \(\hept{\begin{cases}x=0\\x=6\end{cases}}\)

\(25+\left(15-x\right)=30\)

<=> \(25+15-x=30\)

<=> \(x=0\)

học tốt

Answer 4

a)(2x . 6) . (3x-18)=0                                                b)25+(15-x)=30

   Th1:2x . 6=0 hoặc th2:3x-18=0                               15-x=5

           2x=0      hoặc        3x=18                                    x=15-5

            x=0       hoặc         x=6                                        x=10

       

Answer 5

\(25+\left(15-x\right)=30\)

\(25+15-x=30\)

\(40-x=30\)

\(=>x=10\)