Các bạn giải hộ mình với Câu1:Trộn 400ml dd HNO3 1M với 600ml dd gồm NaOH 0.5M và Ba(OH)2 0.25M. Tính pH dd thu đc Câu2: Trộn V1 lít dd HCL có pH=1 với V2 lít dd NAOH có pH=12. Tỉ lệ V1\V2 như thế nào để dd thu đc có a; pH=3. b;pH=7. c;pH=11

IIII. Use the correct form of verb 1. Columbus ( discover ) America more than 400 years ago 2. When the teacher came in, the pupils ( play ) games 3. You ( speak ) to Mrs Baker yesterday? No, I ( not see ) her for a long time. I ( not can ) remember when I last ( see ) her. 4. He ( leave ) home 2 weeks ago and we ( not hear ) from him since then. 5. Miss Lee often ( write ) when she was on holiday. 6. Tom ( study ) chemistry for 3 years and then he gave it up. 7. My brother ( join ) the army when he ( be ) young 8. You ( receive ) any letters from your parents yet? 9. How long Bob and Mary ( be ) married? 10. My teacher wasn’t at home when I ( arrive ) He ( just go ). out. V. Make sentences based on the given cues. 1. the style / “Primitive Gothic”. 2. ancient / architecture style / Japan / amazing. 3. temple / built in that type /that/look/like “pagodas”. 4. most beatiful pagodas / city / Nara. 5. the Castle / built / Mayas. 6. the Mayas live / northern part /Yucatan peninsula. 7. it / pyramid / 91 steps /on/ each side. 8. total / steps / 364 plus one. 9. this number / refer /to/ days of / new year. 10. I / busy / talk / you /now. VI. Rewrite the sentences 1. We have a lot of work to do. There is 2. You have six children. You have a big 3. On the table are 2 cups of tea There are 4. He often flies to Bangkok He often goes 5. Our house is far from the school. Our house is not 6. It is essential that you clean your room before going out You need 7. “I advise you to take a holiday” a doctor said You’d better 8. If you don’t rest yourself you will really be ill Unless 9. This is the fastest way to get to the city center There 10. He wrote a letter in two hours It took Các cậu ơi tớ cần gấp mong các cậu giúp

giúp mình bài này nha ( bài chỉ có 1 ý duy nhất thôi ) Cho x= căn(28-16căn3) / ( căn3-1) . Tính P= (x^2+2x-1)^2020

Điền từ thích hợp vào chỗ trống Let me tell you something about my family.My father is sixty-four.He's a lot older than my mother.She is only fifty-one.Dad has his.....(an export business).My mother helps him...the business.I have 2 brother and 2 sister,so they are seven of us altogether in the family. The oldest is my brother Thomas.He is 28. he is...and has 2 children.

lúc 6g30 sáng một xe ô tô đi từ A đến B với tốc độ 60km/giờ và lúc 8 giờ một xe khách cũng đi từ A đến B với tốc độ 80km/giờ. Xác địnhthời gian hai xe gặp nhau (mình ra kết quả 14 giờ nhưng không biết đúng không nhờ các bạn giải giùm mai mình phải nộp bài rồi :(( làm nhanh nhé )

5. l (meet) robert at the supermarket this morning. 6. nancy (be) to viet nam several times. 7. l (not see) your brother yet. 8. when (your father/ give up) smoking? 9. my pen isn't here any more. someone (take) it already. 10. the motorbike looks clean. ( you/ wash) it? mình cần gấp

(y^2)^2=??? Hãy tính ra giá trị

làm hộ bài 2 ai nhanh hơn dc ctrlhn

NÊU SỰ KHÁC NHAU VỀ VẬT LIỆU TỰ NHIÊN VÀ NHÂN TẠO CẤM MẠNG

mỗi bao nặng 3 tạ hỏi 1 ô tô chở 9 tấn thì chở được bao nhiêu bao gạo như vậy