Bài 1:
a) 15 x `x` = 30
`x` = 30 : 15
`x` = 2
b) 40 + `x` = 50
`x` = 50 - 40
`x` = 10
c) `x` - 5 = 20
`x` = 20 + 5
`x` = 25
`a, 15.x=30`
`⇒x=30:15`
`⇒x=2`
` Vậy x=2`
`b, 40+x=50`
`⇒x=50-40`
`⇒x=10`
` Vậy x=10`
`c, x-5=20`
`⇒x=20+5`
`⇒x=25`
` Vậy x=25`
giúp tớ iiii đừng bỏ tớ thế nx :((( P/s có thể tt qua phần HỎI CHI TIẾT nhóooo
giúp mình với ạ! mình hứa sẽ cho 5* ạ! (HÌNH VẼ) Chứng minh Tam Giác DJK vuông cân tại J nếu : 1) AJ=1/4AC . K là trung điểm CB 2) O là giao điểm AC , BD và AJ/AO=BK/BC
Calli : Giảm cân Mọi ngừi có cách giảm cân nào ko sắp đi học ùi :<
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III. Choose one sentence that is closest in meaning to each of the following questions. 1. They last visited me five years ago. A. They haven’t visited me for a long time. B. I haven’t been visited for a long time. C. They haven’t visited me for five years. D. They have known me for five years. 2. Mike turned off the light, then he went to bed. A. Before Mike went to bed, he had turned off the light. B. Before Mike turned off the light, he had gone to bed. C. After Mike had gone to bed, he turned off the light. D. Mike turned off the light as soon as he had gone to bed. 3. I haven’t visited the museum for three months. A. It is three months since I visited the museum. B. I didn’t visit the museum three months ago. C. The last time I visited the museum was three months ago. D. A and C are correct. 4. “John began playing the piano 10 years ago” A. John played the piano 10 years ago. B. John has played the piano for 10 years. C. John used to play the piano 10 years ago. D. John doesn’t play the piano anymore 5. I haven’t seen her for 3 weeks. A. I haven’t seen her since 3 weeks. B. She was seen for 3 weeks. C. It’s 3 weeks since I last saw her. D. It’s 3 weeks before I last saw her. help me pls
mn ơi làm bài này giùm em vs ạ nhưng bài tiếng anh phải phát âm thanks mn
Join each pair of sentences using TOO,ENOUGH 1. The holidays were very cheap. They booked one immediately → 2. The plane was very late. They got to bed at three in the morning → 3. The way to the beach was very long. It took them an hour to walk there → 4. The beach was very crowded. There was hardly room to sit down → 5. The film was boring. We decided to go home. → 6. She is very hard – working. All of us like her. →
Baif4:rewrite the second sentence so that it has a similar meaning with The First one 1.our shool has more than 2000 students Trả lời: 2.Mr.brown is a good english teacher Trả lời : Mng giúp em bài 3,4 với hứa đánh giá 5 sao Em cần gấp ạ
Cho hàm số y = f(x) có đạo hàm f'(x) = $x^{2}$ ($x$+1)($x^{2}$ + 2m$x$ +5) Có bao nhiêu giá trị nguyên của tham số m để hàm số y = f(x) có đúng một điểm cực trị Mọi người cho mình hỏi bài này có thiếu trường hợp m = căn 5 không ? Vì khi căn 5 thay vào thì ($x^{2}$ + 2m$x$ +5) sẽ biến thành hằng đẳng thức bậc 2 nghiệm bội chẵn => có 1 cực trị?
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