These shose're both beautiful and affordable - I can't make ______________  mind

A.in

B.on

C.up

D.with

* Chọn C , make up mind : quyết định

These shose're both beautiful and affordable - I can't make       mind

A.in

B.on

C.up

D.with

Thương là số có 4 chứ số

thương là 4 nhaemmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm ok

a) Δ' = b'² - ac = [-(n-1)]² - 2n + 3

= n² - 2n + 1 - 2n + 3

= n² - 4n + 4 = ( n - 2 )² ≥ 0 ∀ n

hay pt luôn có nghiệm ∀ n (đpcm)

b) Theo Viète ta có : \(\hept{\begin{cases}x_1+x_2=-\frac{b}{a}=2n-2\\x_1x_2=\frac{c}{a}=2n-3\end{cases}}\)

Khi đó P = x₁² + x₂² = ( x₁ + x₂ )² - 2x₁x₂

= ( 2n - 2 )² - 2( 2n - 3 )

= 4n² - 8n + 4 - 4n + 6

= 4n² - 12n + 10

= ( 2n - 3 )² + 1 ≥ 1 ∀ n

Dấu "=" xảy ra <=> n = 3/2 . Vậy MinP = 1

Nếu chuyển từ kho thứ nhất sang kho thứ 2 15 tấn thóc thì số thóc ở kho 2 hơn kho 1: 6 tấn thó

 => lúc đầu kho 2 hơn kho 1:

  15+6=21( tấn thóc)

Lúc đầu kho 1 chứa:

  (216+21);2+15=`113,5(tấn)

Lúc đầu kho 2 chứa:

  216-113,5=102,5(tấn)

  Đ/s:.............

hmm mik nghĩ bạn sai 

Hello, my name is ... Today I will tell you about my favorite TV in the future. It's a wireless TV that can make calls, play games, place orders and communicate and watch alien broadcasts. It will also be very comfortable when it comes to helping us watch movies or look up homework. And alien sports matches will also be broadcast on this wireless TV.

(bài này có vẻ chán :P)

ASJIUHYDEUJDSEJUEDJUDXJUSXJSXJXSJXDJIXDJIDXSXDRDEDSETRDESSXSSSASDFCFSXCSZCXSXSXCAZSCX

DSXC

D

D

S

XCCCCCDSS

\(\frac{11}{12}+\frac{7}{16}\div\frac{-3}{4}-\frac{13}{12}=\)\(\frac{11}{12}+\frac{-7}{12}-\frac{13}{12}=\)\(\frac{-3}{4}\)

\(\left(\frac{1}{2}-\frac{2}{3}\right)\times\frac{4}{5}\)

\(=\frac{-1}{6}\times\frac{4}{5}\)

\(=\frac{-2}{15}\)

\(\left(\frac{-4}{9}\right)\times\frac{3}{8}+\frac{1}{18}\)

\(=\frac{-1}{6}+\frac{1}{18}\)

\(=\frac{-1}{9}\)

\(\frac{2}{7}+\frac{28}{27}\div\left(\frac{-4}{9}\right)\)

\(=\frac{2}{7}+\frac{-7}{3}\)

\(=\frac{-43}{21}\)

1, D

2,D

3, A

4, A

5,D

6, A

7, C

8,  A

9, D

10, A

1. D

2.D 

3. A

4. A

5.D

6. A

7.C

8.A

9. D

10. A

nhỡ sai cũng cho luôn à anh 

Chu vi AMND=36 cm => cạnh AM=DN= 36/4=9cm

=> AB=9+5= 14cm

Tỉ số diện tích AMND/ABCD= AM.MN/AB.BC= 9.9/14.9=9/14