Dung dịch chất nào sau đây làm đổi màu quỳ tím thành đỏ? A: NaOH B: NaCl C: H2 SO4 D: Ca(OH)2 Giúp mình ạ

chứng minh rằng m,n thuộc N ta luôn có m.n(m mũ 2 - n mũ 2) chia hết cho 3 XIN MN LÀM NHANH GIÙM MK NHA MK CẦN GẤP IN CẢM ƠN MN NHÌU HỨA SẼ VOTE 5 SAO LUN NHA

An đi bộ từ nhà đến trường hết 24 phút. Tính quãng đường từ nhà An đến trường, biết rằng An đi với vận tốc 3,5km/giờ

Sân trường hình chữ nhật có chiều dài 45m và hơn chiều rộng 6,5m. giữa sân có một bồn hoa hình tròn đường kính 3,2m. Tính diện tích còn lại của sân trường

trong bài thơ vội vàng , Xuân Diệu đã trả lời câu hỏi " vì sao phải sống vộ vàng ? " như thế nào? GIÚP VS Ạ MK DG CẦN GẤP

Câu 41: Choose the best option to make the correct sentence from the suggestion words. today/ water power/ mostly/ used/ generate electricity. A. Today water power is mostly used generate electricity. B. Today water power is mostly use generate electricity. C. Today water power is mostly used to generate electricity. D. Today water power is used generate electricity. Câu 42: Choose the best answer to complete the following sentences. We both decided to do different things: he wrote a letter… I listened to the radio. A. if B. because C. while D. since Câu 43: Choose the word whose main stress pattern is placed differently from the rest: A. compulsory B. convenient C. correspond D. communicate Câu 44: Choose the best answer to complete the following sentences. ………………the river is awfully polluted, its water is not fit for fish to survive. A. So that B. Since C. Although D. Therefore Câu 45: Choose the sentence (A,B,C or D) which is closest in meaning to the given one. He had a weak heart, which meant he couldn’t walk very far. A. His heart was too weak that he couldn’t walk very far. B. His heart was very weak that he couldn’t walk very far. C. His heart was such weak that he couldn’t walk very far. D. His heart was so weak that he couldn’t walk very far. Câu 46: Choose the best answer to complete the following sentences. She was the first person……broke the silence in the meeting. A. who B. that C. whom D. both A and B are correct Câu 47: Choose the best answer to complete the following sentences. To put off means…….. A. destroy B. postpone C. cancel D. wait Câu 48: Choose the best answer to complete the following sentences. The smaller the room is, the …… furniture it needs. A. fewer B. smaller C. more D. less Câu 49: Choose the best answer to complete the following sentences. Much……… I respect your point of view, I can’t say yes A.what B. so C. as D. which Câu 50: Choose the word whose underlined part is pronounced differently from the rest. A. claimed B. warned C. occurred D. existed

Câu 36. British farmers give up farm work because they……… A. are tired of the farm work B. can not earn their living by farming C. want to leave for the city D. are forced to leave the land. Câu 37. Most British farms are big because…………… A. there are plenty of land B. farming is now industrialized C. small farms are uneconomic D. most British farmers are rich. Câu 38. The small family farms often offer bed and breakfast accommodation to tourist in order to…………….. A. show their friendship B. attract more tourists to their farms C. build up some savings D. improve their earnings Câu 39. Fields on British farms used to be…………….. A. separated from each other by hedges B. full of wild flowers and birds C. a thousand years old D. all are correct Câu 40. Nowadays most field in England are……… A. planted by European B. smaller than they used to be C. larger than fields in Europe D. large by European standards

Cho (p) : y=x^2 /4 và A(-3/2;1) . Viét pt đg đg t(d) đi qua A và tiếp xúc vơis (p)

tong so cong nhan cua 2 cong truong xay dung đc là 300 sau khi chuyển 2 cong nhan cua cong truong 1 sang cong truong 2 thì 2/3 số cong nhan cua cong truong 1 =4/9 số cong nhan cua cong truong 2 hoi so cong nhan cua moi cong truong ban đầu lm nhanh giúp mình

ΔABC cân tại A. Các đường trung trực của AB, AC cắt nhau ở I. Chứng minh AI là tia phân giác của góc A.( Vẽ cả hình ạ )