\(5x+x=39-3^{11}:3^9\)

\(x\left(5+1\right)=39-3^2\)

\(6x=39-9\)

\(6x=30\)

\(x=30:6\)

\(x=5\)

Vậy x = 5

Nhớ k cho mình nhé! Thank you!!!

(2x+1).(x-3) lớn hơn hoặc bằng 0,hãy tìm x

Không có x nha bạn .

có x đấy

Bài này tương tự bên dưới nha .

a) x=0,1,3

b) x=0,1,2

ko biết đúng ko nhỉ

\(x^2⋮\left(x+1\right)\Rightarrow\left(x^2+x\right)-\left(x+1\right)+1⋮\left(x+1\right)\\ \)

\(\Rightarrow x\left(x+1\right)-\left(x+1\right)+1⋮\left(x+1\right)\)

\(\Rightarrow\left(x+1\right)\left(x-1\right)+1⋮\left(x+1\right)\)

Lại có: \(\left(x+1\right)\left(x-1\right)⋮\left(x+1\right)\)

\(\Rightarrow1⋮\left(x+1\right)\Rightarrow x+1\inƯ\left(1\right)=\left\{\mp1\right\}\)

\(\Rightarrow x=0;-2\)

Vậy x= 0; -2

s khong tach x² = x²-1 +1

                          =(x-1)(x+1) +1

1. He is as scrimp as his father

2. The word of Anh Quan is as bad as the word of his friend

3. Her hair is as gold as Quynh Anh hair

4. Manh is as noisy as Anh Quan

5. She is as intelligent as her sister

( k đúng cho mình nha, thanks bạn) 

1. He is as stingy as his father

2. His word is as bad as his friend's 

3. Her hair is as yellow as quynh anh 

4. Manh is as noisy as Anh Quan 

5. She is as intelligent as her sister

a, 15 chia hết cho x-3 

Mà x thuộc N 

=> x-3 thuộc Ư(15)={1,15}

=> x=4,18 

b, 12 chia hết cho 2x-7 

=> 2x-7 thuộc Ư(12)=1,2,3,4,6,12 

Mà 2x-7 lẻ 

=> 2x-7 = 1,3 

=> x=4,5