Bài 7 giải giúp mình vs ạ
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ND
3
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
3 tháng 3 2023
em ơi chưa có bài em nhé, em chưa tải bài lên lám sao mình giúp được
DT
12 tháng 5 2021
Áp dụng BĐT Bunhiacopxki cho 2 bộ số (\(\sqrt{a+b}\),\(\sqrt{b+c}\),\(\sqrt{a+c}\)) và (1,1,1) có: (1.\(\sqrt{a+b}\)+1.\(\sqrt{b+c}\)+1.\(\sqrt{a+c}\))2 ≤ (a + b + b + c + c + a)(12 + 12 + 12)
=> S2 ≤ 2.3 = 6 ⇔ S ≤ \(\sqrt{6}\)
Dấu "=" xảy ra ⇔ \(\sqrt{a+b}\) = \(\sqrt{b+c}\) = \(\sqrt{a+c}\) ⇔ a +b = b + c = c + a
⇔ 1 - c = 1 - a = 1 - b
⇔ a = b = c = \(\dfrac{1}{3}\)
Vậy maxS = \(\sqrt{6}\) ⇔ a = b = c = \(\dfrac{1}{3}\)
6 tháng 10 2021
\(7,\\ a,=\left(3x+1\right)^3\\ b,=\left(2x+3y\right)^3\\ c,mờ.quá\\ d,=\left(3x-1\right)^3\\ e,=\left(\dfrac{x}{2}+y^2\right)^3\\ 8,\\ a,=\left(x+3\right)^3\\ b,=\left(2-x\right)^3\)
AN
26 tháng 5 2021
Gọi x là chiều cao của tam giác ; y là cạnh đáy của tam giác (x,y > 0 )
* chiều cao bằng 3/4 đáy:
x = 3/4y
=> x - 3/4y = 0 (1)
* Nếu chiều cao tăng thêm...tăng thêm 9m^2:
1/2(y-2)(x+3) = 1/2xy + 9 (sau đó bạn tự giải phương trình nha) (2)
Từ (1),(2) suy ra chiều cao là 12m , cạnh đáy là 16m
TT
1
KY
9 tháng 9 2021
Refer
1. “Your cousin speaks English very well” Paul told me
Paul said that ___________my cousin spoke English very well____________
2. “The man broke out of prison yesterday” said the policeman
The policeman told us_that the man had broken out of prison the day beforr__
3. “I’ll lend you this book as soon as I finish it” Owen said to me
Owen said __me that he would lend me that book as soon as he finished it___
4. “I think I forgot to turn off the lights this morning” Brenda told Brian
Brenda told Brian ____that he thought he had forgotten to turn off the lights that morning.____
5. “I work eight hours a day, except when the children are on holiday” said Mrs. Wood
Mrs. Wood said me that he worked eight hours a day, excepted when the children were on holiday
6. “You’ve been making good progress this semester” Miss Lynn told me
Miss Lynn said that _____I had been making good progress that semester_________
7. “If you bought all the tickets, you would win the lottery” the man said
The man told me ______that If I had bought all the tickets, I would win the lottery______________
8. “I like swimming but I don’t go very often” Jill said to Pam
Jill said that ______he liked swimming but he didn’t go very often___________________________
9. “I want to buy it, but I haven’t brought any money” said Patrick
Patrick told me _________that he wanted to buy it, but he hadn’t brought any money_______________________
10. “I’m going to visit my aunt in Hue, but I’m not sure when” said Mai
Mai told me _________that she was going to visit her aunt in Hue, but she was not sure when__________________
ta có ∠1=70o(hai góc đối đỉnh)
hai đường thẳng a và b cùng cắt c tạo thành 30o+150o=180omà hai góc ở vị trí trong cùng phía
=>a//b(dấu hiệu)
=>∠1=∠2(hai góc đồng vị) ta lại có: ∠1=70o(cmt)=>∠2=70o
mà ∠2=∠3(hai góc đối đỉnh)=>∠3=70o
bài hơi khó hiểu(tại bạn không ghi rõ tên góc đó)