Số gam KMnO4 cần dùng để điều chế được 2,24 lít khí oxi (đktc) là: A. 20,7g B. 42,8g C. 14,3g D. 31,6g

Một HCN có nửa P là 315m. Biết b kém a là 73m.Tính a,b của HCN đó

bài 1: a, Đơn giản biểu thức sau khi bỏ ngoặc: (a-b+c) - (d+c-b) b, Tìm các số nguyên n, biết: -35 chia hết cho n-8 bài 2: Cho a,b là hai số nguyên khác nhau. Chứng minh rằng: (a-b).(b-a) là hai số nguyên âm

Giúp mk vs ạ . Mk cần gấp lắm, cảm ơn trước ạ !

Giup minh voi cac su phu oi!thankkkkkk cam on nhieu Tu cau 16-22

Xem và trả lời giúp em phần 1 đọc hiểu với ạ (Ảnh)

IV. Make sentences: Sắp xếp để tạo thành câu hoàn chỉnh 1. rest/ bed/ She/ a/ takes/ her/ in. ________________________. 2. Exercise/ morning/ is/ health/ doing/ for/ good. __________________________________. 3. Should/ healthy/ We/ eat/ foods/ much. ________________________________. 4. Pupils/ class/ today/ many/ can’t/ to/ come. ______________________________. 5. Things/ she/ carry/ heavy/ shouldn’t. ___________________________. 6. week/ had/ last/ sore/ he/ a/ throat. _______________________________. 7. Hear/ sorry/ I’m/ about/ very/ health/ your/ to. ______________________________. 8. Makes/ people/ fever/ don’t/ well/ feel. _________________________________. 9. Twice/ brush/ We/ a/ should/ day/ teeth/ our. __________________________________. 10. headache/ Lan/ bad/ a/ has/ shouldn’t/ and/ TV/ watch/ she. __________________________________. V. Fill in the blank ( Điền vào chỗ trống) 1. F_ST                     2. TOU_H                 3. C_IMB   4. CA_BAGE   5. BOR_D            6. K_IFE    7. MA_CHES       8. S_AIR         9._TOVE    10. B_EAK   11. DAN_EROUS         12. BU_N VI. Matching: Nối 1. Don’t play with the knife a. Because you may fall. 2.Where are you, Tom? b. I’m cooking some rice. 3. Don’t touch the stove c. I want to light the candle. 4. why shouldn’t I climb a tree d. OK, I won’t. 5.What are you doing, Mai? e. He may fall off his bike and break his arm 6. What are you doing with the matches f. I’m upstairs, Mum. 7. Look! Peter is riding his bike too fast g. A knife 8. What are you holding in your hand? h. You may get a burn. VII. Read and answer the question ( Đọc đoạn văn và trả lời câu hỏi) Falling is common type of accident for young children at home. Your baby brother or sister may fall off a bed or a sofa. He or she may also fall down the stairs. The following tips can help to keep your baby brother or sister safe: - Make sure he or she can’t roll off the bed. - Make sure he or she can’t open any windows. - Don’t let him or her go near the stairs. - Don’t let him or her out on the balcony. 1. What is the common type of accident for young children at home? ............................................................................................................... 2. How to prevent a child from falling out of the windows? ............................................................................................................... 3. What may happen if a child goes near the stairs? ................................................................................................................ 4. What should we do when a child is on the bed or a sofa? ............................................................................................................... VIII. Give the correct from of the verbs in the bracket ( Cho dạng đúng của động từ trong ngoặc điền vào chỗ trống): 1. Don’t (let) ________your child play with a knife. 2. Mary (cook) ______________in the kitchen at present. 3. Where are you, Peter?I(be) _________upstairs, Mom. 4. Jimmy(climb) __________the apple tree yesterday. He (fall) _____and (break)___________his leg. 5. Look! He(run)_________down the stair. He may break his arm. 6. Mai has a ___________. She (go)__________to the dentist tomorrow. 7. Hoa (wash)____________her hair three times a week. 8. Last Monday, My mother(have)_____________a bad pain in her

M=lim(x đến3) (căn4x+5)-3/(mũ3 trên căn 5x+3)-2

Làm từ câu 15 - 18 giúp mình nha

Giải hộ vs ạ(mong nn giải hộ e)