Question

- 7 + x = 15 

2 . x - 10 = - 26

/ x+ 7 = 4

( x - 9 ) ( 3x+ 6 ) =0

mn giải hộ mik vơi

trả lời luôn nha 

 

Answer 1

-7+x = 15

=> x = 15-(-7) = 22

2.x-10 = -26

=> 2.x = -26+10 = -16

=> x = -16 : 2 = -8

|x+7| = 4 

=> x+7=-4 hoặc x+7=4

=> x=-11 hoặc x=-3

(x-9).(3x+6) = 0

=> x-9=0 hoặc 3x+6=0

=> x=9 hoặc x=-2

Tk mk nha

Answer 2

1) Ta có: \(-7+x=15\)

\(\Rightarrow x=15-\left(-7\right)\)

\(\Rightarrow x=22\)

2) \(2x-10=-26\)

\(\Rightarrow2x=-26+10\)

\(\Rightarrow2x=-16\)

\(\Rightarrow x=-8\)

3) \(\left|x+7\right|=4\)

\(\Rightarrow x+7=\pm4\)

Nếu x + 7 = 4 thì x = -3

Nếu x + 7 = -4 thì x = -11

Vậy \(x=\left\{-3;-11\right\}\)

4) \(\left(x-9\right)\left(3x+6\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-9=0\\3x+6=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0+9\\3x=-6\end{cases}\Rightarrow}\orbr{\begin{cases}x=9\\x=-2\end{cases}}}\)

Vậy \(x=\left\{9;-2\right\}\)

Answer 3

\(-7+x=15\)

\(x=15+7\)

\(x=22\)

vậy____

\(2.x-10=-26\)

\(2.x=-26+10\)

\(2.x=-16\)

\(x=-16:2\)

\(x=-8\)

vậy_____

\(\left|x+7\right|=4\)

\(\Rightarrow\orbr{\begin{cases}x+7=4\\x+7=-4\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=4-7\\x=-4-7\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-3\\x=-10\end{cases}}\)

vậy______

\(\left(x-9\right)\left(3x+6\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-9=0\\3x+6=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=0+9\\3x=0-6\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=9\\3x=-6\end{cases}}\Rightarrow\orbr{\begin{cases}x=9\\x=-6:3\end{cases}}\Rightarrow\orbr{\begin{cases}x=9\\x=-2\end{cases}}\)

vậy_____

Answer 4

-7 + x = 15 => x= 15+7=22

2x -10 = -26 

=> 2x= -26 +10 = -16

=> x= -8

1/x +7 =4 =>  1/x = 4-7= -3

=> x= 1/-3 

(x-9)(3x+6) = 0

=> x-9 = 0  hay  3x +6=0

=> x=9  hay x= -2