If nobody rings the police, he will get good marks.

-> ...

Chuyển thành câu bị động

1. How many dresses have you bought?

2. Who are they talking about?

3. What are you buying?

4. How do people make car?

5. How do they cook soup?

Chuyển thành câu bị động

1. What does she like?

2. Who did you invite?

3. When will your father buy a new car?

4. Which poem did you read?

5. Whar have you done?

6. Whar colour do you paint?

Chuyển thành câu bị động

1. What do they teach?

2. How much money do you spend on shoes?

3. How many have you made?

4. Who do you love?

5. What do you want?

6. Where does your friend hold the party?

b. (x - 1).(5x + 3) = (3x - 8).(x - 1)

<=> (x - 1).(5x + 3) - (3x - 8).(x - 1) = 0

<=> (x - 1).[(5x + 3) - (3x - 8)] = 0

<=> (x - 1).(5x + 3 - 3x + 8) = 0

<=> (x - 1).(2x + 11) = 0

<=> x - 1 = 0 hoặc 2x + 11 = 0

<=> x = 1 hoặc x = -5,5

Vậy S = { 1;-5,5 }

Cho 5,6g Fe tác dụng 100ml dung dịch HCl (đktc)

a. Tính khối lượng muối thu được

b. Tính thể tích khí sinh ra, nồng độ mol dung dịch HCl

b) \(\dfrac{2x-1}{3}-\dfrac{x+3}{2}>1+\dfrac{5x}{6}\)

<=> \(\dfrac{2.\left(2x-1\right)}{3.2}-\dfrac{3.\left(x+3\right)}{3.2}>\dfrac{1.6}{6}+\dfrac{5x}{6}\)

=> 4x - 2 - 3x - 9 > 6 + 5x

<=> 4x - 3x - 5x > 6 + 9 + 2

<=> -4x > 17

<=> \(\dfrac{-17}{4}\)

Vậy S = { \(\dfrac{-17}{4}\) }

a) \(\dfrac{3}{x-7}+\dfrac{2}{x+7}=\dfrac{5}{x^2-49}\)

(ĐKXĐ: x khác 7; x khác -7)

<=>\(\dfrac{3.\left(x+7\right)}{\left(x-7\right).\left(x+7\right)}+\dfrac{2.\left(x-7\right)}{\left(x+7\right).\left(x-7\right)}=\dfrac{5}{\left(x+7\right).\left(x-7\right)}\)

=> 3x + 21 + 2x - 14 = 5

<=> 3x + 2x = 5 + 14 - 21

<=> 5x = -2

<=> x = \(\dfrac{-2}{5}\)

Vậy S = { \(\dfrac{-2}{5}\) }