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26 tháng 7 2021

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26 tháng 7 2021

19. 3x2-4x+1

= 3x2-3x-x+1

= (3x2-3x)-(x-1)

= 3x(x-1)-(x-1)

= (3x-1)(x-1)

20.3x2+4x-7

= 3x2+3x-7x-7

= (3x2+3x)-(7x+7)

= 3x(x+1)-7(x-1)

= (3x-7)(x-1)

21.3x2+7x-6

= 3x2+9x-2x-6

= (3x2+9x)-(2x+6)

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

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

22.3x2+3x-6

= 3x2+6x-3x-6

=(3x2+6x)-(3x+6)

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

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

= 3(x-1)(x+2)

23. 3x2-3x-6

=(3x2-6x)+(3x-6)

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

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

= 3(x+1)(x-2)

24.6x2-13x+6

= 6x2-9x-4x+6

= (6x2-9x)-(4x-6)

=3x(2x-3)-2(2x-3)

=(3x-2)(2x-3)

25.6x2+13x+6

= 6x2+9x+4x+6

= (6x2+9x)+(4x+6)

=3x(2x+3)+2(2x+3)

=(3x+2)(2x+3)

26. 6x2+15x+6

= (6x2+12x)+(3x+6)

= 6x(x+2)+3(x+2)

=(6x+3)(x+2)

=3(2x+1)(x+2)

27. 6x2-15x+6

= (6x2-12x)-(3x-6)

= 6x(x-2)-3(x-2)

=(6x-3)(x-2)

=3(2x-1)(x-2)

28. 6x2+20x+6

= (6x2+18x)+(2x+6)

= 6x(x+3)+2(x+3)

= (6x+2)(x+3)

= 2(3x+1)(x+3)

29.6x2-20x+6

= (6x2-18x)-(2x-6)

= 6x(x-3)+2(x-3)

= (6x-2)(x-3)

= 2(3x-1)(x-3)

30.6x2+12x+6

= (6x2+6x)+(6x+6)

= 6x(x+1)+6(x+1)

= (6x+6)(x+1)

= 6(x+1)(x+1)

= 6(x+1)2

22 tháng 10 2021

1 he didn't have to study for his exam

2 she weren't lazy, she could pass the exam

3 If my brother had left the car keys, I could have picked him up at the station

4 he pays me tonight, I will have enough money to buy a car

5 he didn't smoke too much, he could get rid of his cough

6 I hadn't lost my key, I wouldn't have had to pound on the door.....

7 she weren't shy, she would enjoy the party

8 I get a work permit, I will stay for another month

9 he took some exercises, he wouldn't be so unhealthy

10 those people had been prepared  to face the floods, the consequence wouldn't have been disastrous

11 she starts working hard now, she won't be able to pass the final test

12 you are patient, you won't get success

13 somebody waters these flowers. they will die

14 it doesn't stop raining, we won't go out

15 hhe hadn't drunk alcohol, he would have passed the contest

20 tháng 10 2021

 B

24 tháng 9 2023

1. His mane is Bob.

2. He does his homework, play computer games and relax in his bedroom.

3. The wardrobe is in his room, between the desk and the bed.

4. There is a desk, a chair, a wardrobe, a bed and a bookshelf in his room.

5. There are five pens on his desk.

25 tháng 9 2023

1. His name is Bob.

2. He does his homework, play computer game and relax here.

3. The wardrobe in his room, between the desk and the bed.

4. There is a desk, a chair, a wardrobe, a bed and a bookshelf in his room.

5. There are five pens in his desk.

18 tháng 2 2022

20 eat

21. is playing

22. washes

23. rings

24. bring

18 tháng 2 2022

20 eat

21 is playing

22 washes

23 rings

24 bring

Bài 6:

b: PTHĐGĐ là:

\(x^2+4x-1=x-3\)

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

\(\Leftrightarrow\left[{}\begin{matrix}x=-4\\x=1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}y=-7\\y=-2\end{matrix}\right.\)

5 tháng 11 2021

Có thể giúp em mấy câu trắc nghiệm đc ko ạ