a) $\dfrac{2x-1}{16}=\dfrac{x+7}{8}$
$↔(2x-1).8=16.(x+7)$
$↔16x-8=16x+112$
$↔16x-8-16x-112=0$
$↔-120=0$ (vô lý)
$↔x∈∅$
b) $\dfrac{1-2y}{3}=\dfrac{4y+1}{2}$
$↔(1-2y).2=(4y+1).3$
$↔2-4y=12y+3$
$↔2-4y-12y-3=0$
$↔-16y-1=0$
$↔-16y=1$
$↔y=-\dfrac{1}{16}$
Đáp án:
$a) \dfrac{2x-1}{16} =\dfrac{x+7}{8}$
$⇔8(2x-1) = 16.(x+7)$
$⇔ 16x -8 = 16x +112$
$⇔16x -16x = 112 +8$
$⇔0x = 120$
⇔ x vô nghiệm
$\text{Vậy x ∈ {∅ } }$
$b) \dfrac{1-2y}{3} = \dfrac{4y+1}{2}$
$⇔ 2(1-2y) = 3(4y+1)$
$⇔ 2 -4y = 12y +3$
$⇔ -4y -12y = 3 - 2$
$⇔-16y = 1$
$⇔y = -\dfrac{1}{16}$
$\text{Vậy $x = - \dfrac{1}{16}$ }$
giải dùm toiiiiii điiiiiiiiiiiiiii
Mn ai chép mạng cmt ở dưới cho mình với nhé
Tìm tất cả giá trị của hàm số $y=\dfrac{x+a}{x^2+1}$ chứa đoạn $[0;1]$
Vẽ cho em một bát cháo còn nóng nha thank mn
giải dùm điiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
Bai I. Combine sentences using : where, where, when or which 1. Manchester is the largest city in USA. My brother lives there. 2. I've recently gone back to the town. I wàs born in the town. 3. Do you know the name of the hotel ? John is staying at the hotel. 4. We enjoy the city. We spent our vacation there. 5. We enjoy this city. It has been renewed a lot after the war. 6. 15 th June is the day. I was born on that day. 7. This is the house. The house has a big garden. 8. This is the house. I was born in the house. 9. May Day is the day. People hold a meeting on that day. 10. Ha Noi is the place. I'd like to come to Ha Noi. 11. Summer is the time. The weather is very hot then. 12.1 don't like Summer. It's often hot then. 13. The hed was comfortable. I slept in it last night. 14. I never forget the park. We met each other for the first time at this park. 15.I do not know the reason. She left school for it. 16. We have not decided the day. I'll go to London on that day. 17. Our school has a good laboratory. The students practice chemistry in the laboratory. 18, Our school has a good laboratory. Mr John designed it in 19. This is the time. My plane will arrive then. 20. I love my parents' house. I was born in that house. 21. The book is a telephone directory. We can look up tel number in this bo 22. We first met in The revolution took place then. 23. This is the house. We have lived there for five years. 24. We often visit our friends in Brostol. It is only miles away.
Sử dụng mật mã mưa rơi để có đáp án
lập dàn ý và viết bài văn kể về ngày sinh nhật của em.
Cho bản đồ có tỉ lệ 1:6.000.000 cho biết 5cm trên bản đồ tương ứng với bao nhiêu km trên thực tế Cần được giải thích cách làm
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