1d

2e

3b

4c

5a

1.d

2.e

3.b

4.c

5.a

1d

2e

3b

4c

5a

?

lỗi bn !

Lag Lag

went

drove

arrived - was

asked

said

told

walked

saw

stopped - bought

was

1, went
2, drove
3, arrived - was
4, asked - had
5, said
6, told
7, walked
8, saw
9, stopped - bought
10, was

1 went

2 drove

3 arrived/was

4 asked/had

5 said

6 told

7 walked

8 saw

9 stopped/bought

10 was

I went swimming yesterday.

Mrs. Nhung washed the dishes.

My mother went shopping with her friends in the park.

Nam and I studied hard last weekend.

My father played golf yesterday.

Last night, Phong listened to music for two hours.

They had a nice weekend.

I went swimming yesterday

Mrs. Nhung washed the dishes

My mother went shopping with her friends in the park

Lan cooked chicken noodles for dinner

Name and I studied hard last weekend

My father played golf yesterday

Last night, Phong listened to music for 2 hours

They had a nice weekend

Lời giải:

Đặt $\frac{a}{b}=\frac{c}{d}=k$

$\Rightarrow a=bk, c=dk$. Khi đó:

$\frac{a-b}{b}=\frac{bk-b}{b}=\frac{b(k-1)}{b}=k-1(1)$

$\frac{c-d}{d}=\frac{dk-d}{d}=\frac{d(k-1)}{d}=k-1(2)$

Từ $(1); (2)\Rightarrow \frac{a-b}{b}=\frac{c-d}{d}$

-------------------

$\frac{2a+3b}{2a-3b}=\frac{2bk+3b}{2bk-3b}=\frac{b(2k+3)}{b(2k-3)}=\frac{2k+3}{2k-3}(3)$

$\frac{2c+3d}{2c-3d}=\frac{2dk+3d}{2dk-3d}=\frac{d(2k+3)}{d(2k-3)}=\frac{2k+3}{2k-3}(4)$

Từ $(3); (4)\Rightarrow \frac{2a+3b}{2a-3b}=\frac{2c+3d}{2c-3d}$

\(\left(2x-1\right)^5=x^5\)

\(2x-1=x\)

\(2x-x=1\)

\(x=1\)

_________________________

\(2x^2+2=20\)

\(2x^2=20-2\)

\(2x^2=18\)

\(x^2=\dfrac{18}{2}\)

\(x^2=9\)

\(x=\pm3\)

Ngày thứ hai nhà máy sản xuất được số tấn đường là:

1,17-0,12= 1,05 (tấn)

Cả hai ngày thứ nhất và thứ hai, nhà máy sản xuất được số tấn đương là:

1,17+1,05=2,22 (tấn)

Ngày thứ ba nhà máy sản xuất được số tấn đường là:

4,14-2,22=1,92 (tấn)

"Chúc em học tốt."

11. B

12. D

13. A

14. D

15. D

1, went

2, came

3, bought

4, had

5, did

1, We opened the door

2, You wrote poems

3, Richard played in the garden

4, Kerry didn't speak English

5, Did you see the bird?

I

1 went

2 came

3 bought

4 had

5 did

II

Whe opened the door

You wrote poems

Richard played in the garden

Kerry didn't speak English

Did you see the bird?