Làm giúp e câu 33 vs ạ 
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09
0
AH
Akai Haruma
Giáo viên
15 tháng 7 2023
Lời giải:
a.
$-A=x^2-2x=(x^2-2x+1)-1=(x-1)^2-1\geq 0-1=-1$ (do $(x-1)^2\geq 0$ với mọi $x$)
$\Rightarrow A\leq 1$
Vậy $A_{\max}=1$. Giá trị này đạt tại $x=1$
b.
$-B=9x^2+6x-19=(9x^2+6x+1)-20=(3x+1)^2-20\geq 0-20=-20$
$\Rightarrow B\leq 20$
Vậy $B_{\max}=20$. Giá trị này đạt tại $3x+1=0\Leftrightarrow x=\frac{-1}{3}$
c.
$-C=3x^2-12x=3(x^2-4x)=3(x^2-4x+4)-12=3(x-2)^2-12\geq 3.0-12=-12$
$\Rightarrow C\leq 12$
Vậy $C_{\max}=12$. Giá trị này đạt tại $x-2=0\Leftrightarrow x=2$
d.
$-D=y^2-5y+4=(y^2-5y+2,5^2)-2,25=(y-2,5)^2-2,25\geq -2,25$
$\Rightarrow D\leq 2,25$
Vậy $D_{\max}=2,25$
Giá trị này đạt tại $y-2,5=0\Leftrightarrow y=2,5$
e.
$-E=3y^2-4y+7=3(y^2-\frac{4}{3}y)+7$
$=3[y^2-\frac{4}{3}y+(\frac{2}{3})^2]+\frac{17}{3}=3(y-\frac{2}{3})^2+\frac{17}{3}\geq \frac{17}{3}$
$\Rightarrow E\leq \frac{-17}{3}$
Vậy $E_{\max}=\frac{-17}{3}$ khi $y-\frac{2}{3}=0\Leftrightarrow y=\frac{2}{3}$
DT
Đỗ Thanh Hải
CTVVIP
21 tháng 5 2021
1 I asked her if she had met my friend
2 He asked me if I could swim
3 Nam told Lan he was writing to her friend that night
4 They told him they gave him a pen
5 Peter told Mary her father had just come to his house
6 Mr Hiep told the pupils he often gave them good advice
7 She told him she had met him at the beach the day before
8 Nam asked Hong if she had been tired the day before
1 She asked Nam where he was going
2 They asked Hoa what her friend had read
9 I asked Peter why he went to her house
10 Lan asked Huong when she would visit her friend?
11 He asked her what her name was
12 Yom asked Mart where she had met his sister
13 Peter asked Daisy if she was writing to his brother
14 Peter told Mary to bring him her pen
15 She told him not to tell her brother about it
16 Mai told Huong to go to her friend's house with her
17 Hong told Nam to try his best
18 He told me not to go out alone at night
19 He asked me if I visited his friend often
20 She asked me if I liked her
21 He asked Hoa what had made her sad
22 Mr Pike asked Mary where she often went
23 She said she would go to visit Nha Trang
24 Mary told Tom she had seen his friend going with her friend
25 I said I would go to visit her
26 Lan told me she gad read my book ten days before
27 Hoa told Hung she had been writing to him
28 She asked him why he hadn't gone to the party the day before
29 Peter asked Daisy where they were going to meet each other the next Sunday
30 he asked Hoa of she had met her friend
21 tháng 5 2021
1. I asked her if she had met my friend.
2. He asked me if I could him.
3. Nam said to Lan that he was writing to her friend that night.
4. They offered to give him a pen.
5. Peter said to Mary that her father had just come to his house.
6. Mr Hiep said to the pupils that he often gave them good advice.
7. She said to him that she had met him the day before.
8. Nam asked Hong if she had been tired the day before.
1. She asked Nam where he was going.
2. They asked Hoa what her friend had read.
9. They asked Peter why he didn't go to her house.
10. Lan asked Huong when she would visit her friend.
11. He asked her what her name was.
12. Tom asked Mary where she had met his siter.
13. Peter asked Daisy if she was writing to his brother.
14. Peter asked Mary to bring him her pen.
15. She asked him not to tell her mother about it.
16. Mai asked Huong to go to her friend's house with her.
17. Huong encouraged Nam to try his best.
18. He warned her not to go out alone at night.
19. He asked me if I visited his friend often.
20. She asked me if I liked her.
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1
