Ta có \(\left(x-5\right)^4=\left(x-5\right)^6\) 

=> \(\orbr{\begin{cases}x-5=\pm1\\x-5=0\end{cases}}\) 

(+) \(x-5=-1=>x=4\) 

(+) \(x-5=1=>x=6\) 

(+) \(x-5=0=>x=5\) 

Vậy

\(\left(x-5\right)^4=\left(x-5\right)^6\)

\(\Rightarrow\orbr{\begin{cases}x-5=\pm1\\x-5=0\end{cases}}\)

+) x - 5 = 1 \(\Rightarrow\)x = 6

+) x - 5 = -1 \(\Rightarrow\)x = 4

+) x - 5 = 0 \(\Rightarrow\)x = 5

Vậy x \(\in\){6;4;5}

\(\left(x-5\right)^4=\left(x-5\right)^6\)

\(\left(x-5\right)^4-\left(x-5\right)^6=0\)

\(\left(x-5\right)^4-\left(x-5\right)^4\cdot\left(x-5\right)^2=0\)

\(\left(x-5\right)^4\left[1-\left(x-5\right)^2\right]=0\)

\(\Rightarrow\orbr{\begin{cases}x-5=0\\1-\left(x-5\right)^2=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=5\\x-5=\left\{\pm1\right\}\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=5\\x=\left\{6;4\right\}\end{cases}}\)

Vậy \(x=\left\{4;5;6\right\}\)

\(\left(x-5\right)^4=\left(x-5\right)^6\)

\(\left(x-5\right)^6-\left(x-5\right)^4=0\)

\(\left(x-5\right)^4\left[\left(x-5\right)^2-1\right]=0\)

\(\Leftrightarrow\orbr{\begin{cases}\left(x-5\right)^4=0\\\left(x-5\right)^2-1=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x-5=0\\\left(x-6\right)\left(x-4\right)=0\end{cases}}\)

1: \(x-5=0\Leftrightarrow x=5\)

2.\(\left(x-6\right)\left(x-4\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-6=0\\x-4=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=6\\x=4\end{cases}}\)

Vậy ...

7 ( x - 6 ) = 4x + 9

7x - 42 = 4x + 9

7x - 4x = 9 + 42

3x = 51

x = 51 : 3

x = 17

Vậy x = 17

\(7\left(x-6\right)=4x+9\)

\(7x-42=4x+9\)

\(7x-4x=9+42\)

\(3x=51\)

\(x=51:3\)

\(x=17\)

carve 

hold

1 . Skipping : đang nhảy                          5 . having : đang có 

2 . Swimming : đang bơi                         6 . decorating : đang trang trí

3 . Talking : đang nói                              8 . Buying : đang mua 

4 . Sailing : đang chèo thuyền                9 . Lying : đang nằm 

want,need,forget,remember,understand,,love,enjoy.

Jane sings well s a singer

The little boy has a new T - shirt he often wears it when it is sunny.

Hok tot !