cho dạng đúng của động từ trong ngoặc để hoàn thành câu

1. i'm so annoyed about my car crash. if only i (be) more careful

2. it's time you (see) the dentist

3. i've no idea where we are . if only we (take) a map

4. i'd rather (not/go) on the trip

5. jean thinks she's the best. if only she (know) what people say behind her back

6. i'd rather you (not/tell) anyone about our conversation

7. that was a lovely meal. if only i (not/eat) so much

8. i wish paul (tell) me what's wrong with him

9. i'd rather (read) the book

10. you'd better (talk) with him

11. i'd rather he (not/make) so much noise

12. if only i (ask) my parents before i made the decision

13. you'd better (not/ argue) with your boss

14. it's hight time you(stand) up for yourself

15. i wish i (be) rich and famous

16. i wish Alan (not/move) away i will miss him

17. it seems as if she (forget) about the meeting

Viết lại câu sử dụng cấu trúc too.......to

1. helen is very ill. she can't work

2. my grandfather is very old. he can't travel

3. the food is very salty. we can't eat it

4. kate's very hot. she can't play table tennis

5. i'm very thirsty. i can't finish this exercise

1) Tính

a) \(\sqrt{46-6\sqrt{5}}-\sqrt{29-12\sqrt{5}}\)

b) \(\sqrt{13-\sqrt{160}}-\sqrt{53+4\sqrt{90}}\)

c) \(\left(3-\sqrt{2}\right)\sqrt{7+4\sqrt{3}}\)

d) \(\left(\sqrt{7}-\sqrt{3}\right)\sqrt{10+2\sqrt{21}}\)

e) \(\left(3\sqrt{2}+10\right)\sqrt{38-12\sqrt{5}}\)

1]

a) \(\left(12\sqrt{50}-8\sqrt{200}+7\sqrt{450}\right):\sqrt{10}\)

b) \(\left(\frac{\sqrt{1}}{7}-\sqrt{\frac{16}{7}}+\sqrt{\frac{9}{7}}\right):\sqrt{7}\)

Cho hình thang ABCD (AB//CD), góc A=90 độ và AC vuông góc với BD. vẽ hình bình hành ABDE. CM

a) diện tích ACD = diện tích ABCD

b) AD= \(\sqrt{AB.CD}\)

1] rút gọn

a) (\(\sqrt{12}\) + \(3\sqrt{5}\) - \(4\sqrt{135}\)) 13

b) \(\sqrt{252}\) - \(\sqrt{700}\) + \(\sqrt{1008}\) - \(\sqrt{448}\)

c) \(2\sqrt{40\sqrt{12}}\) - \(2\sqrt{\sqrt{75}}\) -\(3\sqrt{5\sqrt{48}}\)

2]

a) A= \(\frac{\sqrt{6}+\sqrt{14}}{2\sqrt{3}+\sqrt{28}}\)

b) B= \(\frac{9\sqrt{5}+3\sqrt{27}}{\sqrt{5}+\sqrt{3}}\)

c) C= \(\frac{3\sqrt{8}-2\sqrt{12}+\sqrt{20}}{3\sqrt{18}-2\sqrt{27}+\sqrt{45}}\)

1) đốt cháy photpho trong bình chứa 3,36l khí O2(đktc) thu đc 7,1g P2O5. tính mP (phản ứng)?

2) đốt cháy 1,4g hỗn hợp cacbon và lưu huỳnh thì cần 1,4l O2. tính khối lượng mỗi chất?