Khi cho 300 ml dung dịch HNO3 vào 200 ml dung dịch Ca(OH)2 0,15M thì vừa đủ trung hòa.Tính nồng độ mol/lít của dd HNO3 ban đầu

Đường thẳng qua hai cực trị của hàm số f(x)= (x ²-3x+1)/(2-x) song song với a y=-2x+3 b y=-2x-2 c y = 1/2x +2 d y = 1/2x -1/2 cám ơn ai giải dùm nha

Cân bằng pt SO3 + NaOH =>NaSo4 + H2O

Mong mọi người giúp ạ hiện đang cần gấp

Viết hai số hữu tỉ x, y dưới dạng: x = a/m; y = b/m (a, b, m ∈ Z, m > 0)

cách tiến hành thí nghiệm tách muối ăn và cát

Một dây dẫn có điện trở bằng 50 Ω muốn cường độ dòng điện qua nó là I = 0,5 A thì cần mắc vào 2 đầu dây một hiệu điện thế là bao nhiêu?

Để viết các số tự nhiên từ 1 đến 100 người ta cần viết tất cả bao nhiêu chữ số 0

6.Tổng số hạt p, n, e trong nguyên tử X là 10. Tìm số khối của nguyên tử X ?

Ghi cấu trúc sương sương thoy nka ( lẹ nhưng đúng nhá :v ) 36. Ally wants to buy that dress, but she doesn’t have enough money. A. If Ally has enough money, she can buy that dress. B. If Ally have enough money, she could buy that dress. C. If Ally had enough money, she will buy that dress. D. If Ally had enough money, she could buy that dress. 37. Your house is more modern than mine. A. My house is more modern than yours. B. My house isn’t as modern as yours house. C. My house isn’t as modern as yours. D. My house is as modern as yours. 38. “If I were you, I would raise money for the poor,” I said to Thomas. A. I advised Thomas to raise money for the poor. B. I said Thomas to raise money for the poor. C. I asked Thomas why he doesn’t raise money for the poor. D. I asked Thomas why didn’t he raise money for the poor. 39. Her father invited him to the conference. A. He was invited to the conference by her father. B. He has been invited to the conference by her father. C. He were invited to the conference by her father. D. He is invited to the conference by her father. 40. This is the first time his children have tried Japanese cuisine. A. His children last tried Japanese cuisine a long time ago. B. His children tried Japanese cuisine at first. C. His children have never tried Japanese cuisine before. D. His children tried Japanese cuisine before.