He should try to come to class on time

Put the following words in the correct order:

to / to / time / should / come / on / he / class / try

=> He should try to come to class on time.

1. They are thinking of (move) .....moving....... to the countryside.

2. Does she want (become) .....to become...... a singer?

3. We l i ke (plant) ...........to plant................. trees in the park at the weekend.

4. I used to (feed) ..............feed................ the children in an orphanage when I lived there.

5. I'm looking forward to (see) ...............seeing................ you at Christmas.

6. My brother hates (wash) .............. .washing................. the dishes after meals.

7. She really enjoys(take) ...taking........ photographs when we travel to the countryside.

8. I hate (play) ..............playing............. computer games all day.

9. The girls enjoy (practise) ...............practising............... fitness exercises after class.

10. We really li ke (work) .............to work.............. in the schoolo Y & Y.

1. They are thinking of (move) .......moving..... to the countryside.

2. Does she want (become) .......to become.... a singer?

3. We (plant) .............planting............... trees in the park at the weekend.

4. I used to (feed) ...............feel............... the children in an orphanage when I lived there.

5. I'm looking forward to (see) ................seeing............... you at Christmas.

6. My brother hates (wash) ..............washing .................. the dishes after meals.

7. She really enjoys(take) ....taking.. photographs when we travel to the countryside.

8. I hate (play) ............playing................ computer games all day.

9. The girls enjoy (practise) ..............practising................. fitness exercises after class.

10. We really (work) ..............working.............. in the schoolo Y & Y.

tua ngược thời gian là ok =)))))

hoc vẩn ok

\(a.\frac{x^3+6x^2+2x-3}{x^2+5x-3}=\frac{\left(x+1\right)\left(x^2+5x-3\right)}{x^2+5x-3}=x+1\)

\(b.\frac{x^3-3x^2+x-3}{x-3}=\frac{\left(x-3\right)\left(x^2+1\right)}{x-3}=x^2+1\)

\(c.\frac{x^2+3x-10}{x-2}=\frac{\left(x-2\right)\left(x+5\right)}{x-2}=x+5\)

ko biết

1. ( x² - x + 2 )⁴ - 3x² ( x² - x + 2 )² + 2x⁴

Đặt t = x² - x + 2 , ta có :

t⁴ - 3x²t² + 2x⁴

= t⁴ - 2x²t² - x²t² + 2x⁴

= t² ( t² - 2x² ) - x² ( t² - 2x² )

= ( t² - x² ) ( t² - 2x² )

= ( t - x ) ( t + x ) ( t² - 2x² )

= ( x² - x + 2 - x ) ( x² - x + 2 + x ) [ ( x² - x + 2 )² - 2x² ]

= ( x² - 2x + 2 ) ( x² + 2x ) ( x² - 3x + 2  ) ( x² + x + 2 )

2. 3 ( - x² + 2x + 3 )⁴ - 26x² ( - x² + 2x + 3 )² - 9x⁴

Đặt y = - x² + 2x + 3 , ta có :

3y⁴ - 26x²y² - 9x⁴

= x²y² + 3y⁴ - 9x⁴ - 27x²y²

= y² ( x² + 3y² ) - 9x² ( x² + 3y² )

= ( y² - 9x² ) ( x² + 3y² )

= ( y - 3x ) ( y + 3x ) ( x² + 3y² )

= ( - x² + 2x + 3 - 3x ) ( - x² + 2x + 3 + 3x ) [ x² + 3 ( - x² + 2x + 3 )² ]

= ( - x² - x + 3 ) ( - x² + 5x + 3 ) ( 3x⁴ - 12x³ - 5x² + 36x + 27 )