i have never seeen a more interesting flim than that one

the weather was so bad that we couldn't go out

it was such an interesting story that i watched twice

how old will you be oon your next birthday

Túi sắt nặng hơn đúng ko?

1a

2a

3a

4a

5a

6a

7b

8a

9a

10b

11a

12b

13a

14b

15a

16b

17a

18a

19a

20b

bạn ngồi bất động thì chả khác gì là tượng à Cơn mưa màu trắng

1. more expensive

2 lovely

3invitation

1 did / what

2 wrote

3 love

4 will buy

ab - ba = (10a + b) - (10b +a)

= 10a + b - 10b - a = (10a - a) - (10b - b)

= 9a - 9b = 9(a - b)

Vậy ab - ba chia hết cho 9 

1goes

2 go

3takes

4 is playing/doesn't enjoy

5wear

6goes

7 work

8aren't

yes. because there are many ueful

(30-3x).7²=3.7²

(30-3x).7²=147

30-3x=147:7²

30-3x=3

3x=30-3

3x=27

x=27:3

x=9