30 nha bạn

Xác định giá trị của a để hàm số:

\(y=\sqrt{2x-3a+4}+\frac{x-a}{x+a-1}\)

Xác định trên \(D=\left(0;+\infty\right)\)

Trong tự nhiên, Cu có 2 đồng vị: \(^{65}_{29}Cu;^{63}_{29}Cu\)

Biết \(\overline{A}_{Cu}=63,54\). Tính phần trăm khối lượng của \(^{65}Cu\) trong phân tử Cu(OH)₂ , CuCO3 ( Cho O = 16, H = 1, C = 12 )

Cho hai vecto \(\overrightarrow{a}\) và \(\overrightarrow{b}\). Trong trường hợp nào thì đẳng thức sau đúng: \(\left|\overrightarrow{a}+\overrightarrow{b}\right|=\left|\overrightarrow{a}-\overrightarrow{b}\right|\)

Thu gọn:

\(\frac{a\sqrt{a}+b\sqrt{b}}{\sqrt{a}+\sqrt{b}}-\sqrt{ab}=\left(\sqrt{a}-\sqrt{b}^2\right)\)

1. My parent first .... each other 20 years ago
A. meet B. met C. are meeting D. have been meeting

2. I ..... her for ages. She lives in London now.

A. haven't seen B. don't see C. hadn't seen D. didn't see

3. Minh ....... scholarship many times over the year.

A. won B. has won C. is winning D. wins

4. Recently, my son .............. interested in watching football

A. has become B. becomes C. will become D. became

5. I'm sure they ........... a new school in this town soon

A. will build B. built C. have been building D. have built

6. My sister ......... Italian food many times before

A. had cooked B. cooked C. has cooked D. was cooking

1. He ( swim ) ... overthere for two hours now

2. She ( tour ) ... around Europe this time next month

3. She ( study ) ... in this class for eight months up to now

1=5

2=10

3=15

4=20

5=1

Vì 1=5 thì 5=1

số đó có phải là 82 ko bạn