4. \(\dfrac{-3}{2}+x-\dfrac{5}{4}=\dfrac{-1}{3}-2x\)

<=> \(\dfrac{-18}{12}+\dfrac{12x}{12}-\dfrac{15}{12}=\dfrac{-4}{12}-\dfrac{24x}{12}\)

<=> -18 + 12x - 15 = -4 - 24x

<=> 12x + 24x = 18 + 15 - 4

<=> 36x = 29

<=> x = \(\dfrac{29}{36}\)

6. \(\dfrac{3}{4}x-\dfrac{3}{2}=\dfrac{5}{6}+\dfrac{3}{8}x\)

<=> \(\dfrac{18x}{24}-\dfrac{36}{24}=\dfrac{20}{24}+\dfrac{9x}{24}\)

<=> 18x - 36 = 20 + 9x

<=> 18x - 9x = 20 + 36

<=> 9x = 56

<=> x = \(\dfrac{56}{9}\)

7. \(3-\left(\dfrac{1}{2}+2x\right)=\dfrac{2}{3}-x\)

<=> \(3-\dfrac{1}{2}-2x=\dfrac{2}{3}-x\)

<=> \(\dfrac{18}{6}-\dfrac{3}{6}-\dfrac{12x}{6}=\dfrac{4}{6}-\dfrac{6x}{6}\)

<=> 18 - 3 - 12x = 4 - 6x

<=> 15 - 4 = 12x - 6x

<=> 11 = 6x

<=> x = \(\dfrac{11}{6}\)

1. John was sad yesterday.

2. The birds were in the cage.

3. The children were in the class.

4. My cat was on the chair.

5. I was at the theater yesterday.

6. It was foggy this morning.

7. They were at home last Sunday.

8. I was very happy yesterday.

9. There were a lot of balloons.

10. You were at the park last night.

a) Hiệu suất thụ tinh của trứng và tinh trùng lak 100% 

-> Số trứng tham gia thụ tinh :  16 trứng

    Số tinh trùng tham gia thụ tinh :  16 tinh trùng

b) Số tb sinh tinh : 16 : 4 = 4 (tb)   (mak mik hỏi tí lak chữ "tg" sau chỗ tb sinh tinh lak viết tắt j v mik ko đọc đc)

c) Kỳ sau giảm phân II :

Số NST : 2n đơn = 16 NST

Số tâm động: 2n = 16 tâm động

Số cromatit : 0 cromatit

I like playing soccer, but I must do my homework before.

We are saving money because we want to buy a new house.

I like English and French books.

Lan saves energy, so she turns off the lights.

1 I like playing soccer but I must do my homework before

2 We are saving money because we want to buy a new house

3 I like English books and French books

4 Lan saves money so she turns off the lights

I like playing soccer but i must do my ......

We are saving money so we want to ........

I like English books and I like ..........

Lan saves energy because she turns off ...

Ta có: \(AB^2+HC^2=\left(AA'^2+A'B^2\right)+\left(A'H^2+A'C^2\right)\)

\(=\left(AA'^2+A'C^2\right)+\left(A'B^2+A'H^2\right)=AC^2+HB^2\)

Lại có: \(BC^2+HA^2=\left(BB'^2+B'C^2\right)+\left(B'H^2+B'A^2\right)\)

\(=\left(BB'^2+B'A^2\right)+\left(B'C^2+B'H^2\right)=AB^2+HC^2\)

\(\Rightarrow AB^2+HC^2=AC^2+HB^2=BC^2+HA^2\)

55 a

56c

57 a

58 c

59 a

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