a,-17/30-11/-15+-7/12 b,-5/9+5/9:(1 2/3-2 1/12) c,-7/25.11/13+-7/25.2/13-18/25

Giúp mình câu a,b thôi nhé.Cảm ơn

Giải giúp em các ví dụ ạ. Em cảm ơn

`3(` $\sqrt{x+3}+$ $\sqrt{6-5x})=2x^2+7$

1. Tính a) 5 $\frac{5}{2}$ - $\frac{4}{6}$ + 1 b) - $\frac{2}{9}$ + $\frac{1}{6}$ - $\frac{5}{9}$

Phân tích bài thơ Sáng thu của Hữu Thỉnh (Không chép mạng )

Give the correct form of the verbs in brackets. 1. There (be)_________________ a lot of tourists in this area recently. 2. Elizabeth usually (go)_________ to work by bus but today she (drive)________________ there. 3. We (have)_________________ a party tomorrow. I (invite)_________________ five of the guests already. 4. When Jane (wake)______________ up this morning, it (rain)_________________ heavily. 5. Listen! Someone (knock)_________________ at the door. 6. Petrol prices (be)_________________ less expensive last year than this year. 7. Before (return)_________________ to his home land, Peter visited some European countries. 8. Mike speaks English well but he has trouble (read)_________________ it.

vẽ hình này nha giúp mik gấp nha

Fill each blank with a suitable word to complete the passage below. There are four members in my family: my parents, my elder sister and I. In my family, we all share the housework. My dad loves cooking, so he cooks most of the (1)____________. Sometimes my mum or my sister (2)____________ him. My mother is often busy working (3)____________ the hospital, so she has (4)____________ time to do the household chores. But she (5)____________ the shopping every day. It is convenient because (6)____________ is an open-air market near our house. At the weekend, we usually eat (7)____________, so nobody has to do the cooking. Though it is more expensive (8)____________ to eat at home, it makes some difference to us. After the meal, we often go somewhere and (9)____________ some fun together. I think I’m lucky to be in a close and happy (10)____________ where all members love and help each other.

Trộn 300g dung dịch H2SO4 9,8 % với 200 g dung dịch BaCl2 26% thu được a gam kết tủa A và dung dịch B. a) Viết phương trình hóa học xảy ra. b) Tính a, tính C% các chất trong dung dịch B