English is spoken in the world

C

A

\(=921-921\times\dfrac{1}{38}\)

\(=921\times\left(1-\dfrac{1}{38}\right)=921\times\dfrac{37}{38}=\dfrac{34077}{38}\)

D

1 writting

2 was being burn

3 stolen

4 will be working

5 not to be disturb

e chẳng bíc cj là ai nhưng e vẫn chúc cj thi good:)

C

\(=6-3x+x^2-4x+4\)

\(=x^2-7x+10\)

\(=x^2-2x-5x+10\)

\(=x\left(x-2\right)-5\left(x-2\right)\)

\(=\left(x-2\right)\left(x-5\right)\)

\(\Leftrightarrow x^2-x^2-2x>3x-1\)

\(\Leftrightarrow-5x>-1\)

\(\Leftrightarrow x< \dfrac{1}{5}\)

Vậy : S = {x|x < \(\dfrac{1}{5}\)}

-------|------)-/-/-/-/->

           0      \(\dfrac{1}{5}\)

\(x+\dfrac{1}{2}=7,2+3,5\)

\(x+\dfrac{1}{2}=10,7\)

\(x=10,7-\dfrac{1}{2}\)

\(x=10,2\)