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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
CT
1
DT
Đỗ Thanh Hải
CTVVIP
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
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.
NV
3
5 tháng 11 2021
Bài 6:
b: PTHĐGĐ là:
\(x^2+4x-1=x-3\)
\(\Leftrightarrow x^2+3x-4=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-4\\x=1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}y=-7\\y=-2\end{matrix}\right.\)
