4 has not been - broke

5 did you - was

6 have youy ever been

II

1 go

2 were

3 eats

7 does - won't worry

8 had played - would have won

9 will - do

10 were - would go

14 would have written

15 won't go

16 tries

17 spoke

19 finish - will go

20 see - ask

Rewrite

1 The man who doesn't work hard can't earn more money

3 If my friend and I had enough money, we would buy a  house of our town

4 If the weather were better now, we could go for a walk

5 If I knew his addres, I would give it to you

6 If he worked slowly enough, he wouldn't make

7 If I were sent to proson, she would visit me 

8 If I won a big prize in a lottery, I would give up my job

9 If the doctor weren't so late, he could see many patients

10 If tickets weren't expensive, we would visit them in Ha Noi

III

1 were

2 would visit

3 would give

Bài 4:

a: Các kết quả có thể xảy ra là {xanh, đỏ, vàng, nâu, cam, tím}

b: Tập hợp là A={xanh, đỏ, vàng, nâu, cam, tím}

c: Hai điều cần chú ý:

-Chỉ được lấy duy nhất 1 viên bi

-Màu của viên bi chỉ có thể là một trong những màu sau: xanh, đỏ, vàng, nâu, cam, tím

Bài 5:

a:

Số lần An đã gieo xúc sắc là 17+18+15+14+16+20=50+50=100(lần)

b: Xác suất thực nghiệm xuất hiện mặt 1 chấm là:

\(\frac{17}{100}\)

c: Số lần xuất hiện mặt có số chấm chẵn là 18+14+20=32+20=52(lần)

Xác suất thực nghiệm là \(\frac{52}{100}=\frac{13}{25}\)

\(3km^24dam^2=3,004km^2\)