`3x(x-1)-x+1=0`

`<=> 3x(x-1) -(x-1)=0`

`<=>(x-1)(3x-1)=0`

\(\Leftrightarrow\left[{}\begin{matrix}x-1=0\\3x-1=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=1\\3x=1\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{1}{3}\end{matrix}\right.\)

Vậy \(S=\left\{1;\dfrac{1}{3}\right\}\)

sao bà con gái mà mạnh mẽ quá zayy

Bậc của đa thức trên là : `5`

`3*(2x-11)^2 +6=3^4`

`=> 3*(2x-11)^2 = 3^4 -6`

`=> 3*(2x-11)^2=75`

`=> (2x-11)^2 =75:3`

`=>(2x-11)^2=25`

`=>(2x-11)^2=(+-5)^2`

\(\Rightarrow\left[{}\begin{matrix}2x-11=5\\2x-11=-5\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}2x=16\\2x=6\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=8\\x=3\end{matrix}\right.\)

\(\left(\dfrac{2x-1}{x+1}-\dfrac{x^2-x+1}{x^2+x}\right)\cdot\dfrac{x^2}{x-1}\)

\(đkxđ:\left\{{}\begin{matrix}x+1\ne0\\x-1\ne0\\x\ne0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\ne-1\\x\ne1\\x\ne0\end{matrix}\right.\)

 \(\left(\dfrac{2x-1}{x+1}-\dfrac{x^2-x+1}{x^2+x}\right)\cdot\dfrac{x^2}{x-1}\\ =\left(\dfrac{2x-1}{x+1}-\dfrac{x^2-x+1}{x\left(x+1\right)}\right)\cdot\dfrac{x^2}{x-1}\\ =\left(\dfrac{x\left(2x-1\right)-\left(x^2-x+1\right)}{x\left(x+1\right)}\right)\cdot\dfrac{x^2}{x-1}\\ =\dfrac{2x^2-x-x^2+x-1}{x\left(x+1\right)}\cdot\dfrac{x^2}{x-1}\\ =\dfrac{\left(x^2-1\right)\cdot x^2}{x\left(x+1\right)\cdot\left(x-1\right)}\\ =x\)

Bn k cô đơn ☕

Mà hầu hết CTV nào cx lười=)))

                              Giải

Buổi sáng cửa hàng bán được số tấn gạo là :

      `450 xx 65 : 100 =292,5` ( tấn gạo )

Buổi chiều cửa hàng bán được số tấn gạo là :

      `450 -292,5=157,5` ( tấn gạo )

Bạn này ế bằng thực lực đâu ra ny=)))))☕

A. PRONUNCIATION

I. Choose the word whose underlined part is pronounced differently.

1. A. blond                  B. vegetable                C. black                      D. blanket

2. A. sister                  B. his                           C. police                     D. six

3. A. light                    B. stripe                      C. slim                         D. fine

4. A. sandwich                        B. salad                       C. later                         D. jacket

5. A. wear                   B. sneakers                 C. beach                      D. clean

6. A. spider                 B. slim                         C. kind                         D. striped

7. A. fish                     B. spring                     C. singer                     D. ski

8. A. novel                  B. soccer                     C. role                         D. comic

9. A. idea                    B. repeat                     C. please                     D. cream

10. A. black                B. block                      C. able                        D. blind

\(a,\cdot\left\{\left[\left(2\sqrt{2}\right)^2:2,4\right]\cdot\left[5,25:\left(\sqrt{7}\right)^2\right]\right\}:\left\{\left[2\dfrac{1}{7}:\dfrac{\left(\sqrt{5}\right)^2}{7}\right]:\left[2^2:\dfrac{\left(2\sqrt{2}\right)^2}{\sqrt{81}}\right]\right\}\\ =\left[\left(8:2,4\right)\cdot\left(5,25:7\right)\right]:\left[\left(\dfrac{15}{7}:\dfrac{5}{7}\right):\left(4:\dfrac{8}{9}\right)\right]\\ =\left(\dfrac{10}{3}\cdot\dfrac{3}{4}\right):\left(3:\dfrac{9}{2}\right)\\ =\dfrac{5}{2}:\dfrac{2}{3}\\ =\dfrac{15}{4}\)