câu 39 thêm từ before đằng sau nha

bẽ bàn

38.The test was so easy that we did it well.

- It was such an easy test that we did it well

   39.This is the most interesting film I have ever seen.

- I have never seen such an interesting film like this/ seen any films more interseting than this

   40.People believed that thieves stole 3 diamonds.

- It was believed that thieves stole 3 diamonds

Tham khảo

https://olm.vn/hoi-dap/tim-kiem?id=638956&subject=1&q=++++++++++CMR+(n4-1)+chia+het+cho+8,+v%E1%BB%9Bi+m%E1%BB%8Di+n+l%E1%BA%BB+b%E1%BA%A5t+k%C3%AC+++++++++

Chí công vô tư

c. \(3x^2-7x-10=0\)

\(\Leftrightarrow\left(x-\dfrac{10}{3}\right)\left(x+1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{10}{3}=0\\x+1=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{10}{3}\\x=-1\end{matrix}\right.\)

b. \(2x\left(x-10\right)-x+10=0\)

\(\Leftrightarrow2x\left(x-10\right)-\left(x-10\right)=0\)

\(\Leftrightarrow\left(x-10\right)\left(2x-1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-10=0\\2x-1=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=10\\x=\dfrac{1}{2}\end{matrix}\right.\)

c. \(3x^3+7x^2+17x+5=0\)

\(\Leftrightarrow x^2\left(3x+1\right)+2x\left(3x+1\right)+5\left(3x+1\right)=0\)

\(\Leftrightarrow\left(3x+1\right)\left(x^2+2x+5\right)=0\)

mà \(x^2+2x+5=\left(x+1\right)^2+4\ge4>0\forall x\)

\(\Leftrightarrow3x+1=0\)

\(\Leftrightarrow x=-\dfrac{1}{3}\)

f. \(\left(2x-1\right)^2-\left(x-3\right)^2=0\)

\(\Leftrightarrow\left(2x-1-x+3\right)\left(2x-1+x-3\right)=0\)

\(\Leftrightarrow\left(x+2\right)\left(3x-4\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x+2=0\\3x-4=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=\dfrac{4}{3}\end{matrix}\right.\)

g. \(x^3-5x^2+8x=4\)

\(\Leftrightarrow x^3-5x^2+8x-4=0\)

\(\Leftrightarrow\left(x-1\right)\left(x-2\right)^2=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-1=0\\x-2=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)

Chữ nhỏ quá, đọc k ra bạn ơi

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