Các bạn giúp mình câu 1 2 3 với
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21 tháng 5 2021
Câu 1:
\(\dfrac{3}{5}-\dfrac{5}{6}=\dfrac{18}{30}-\dfrac{25}{30}=\dfrac{18-25}{30}=\dfrac{-7}{30}\)
Câu 2:
\(\dfrac{-5}{9}-\dfrac{-5}{12}=\dfrac{-20}{36}-\dfrac{-15}{36}=\dfrac{-20-\left(-15\right)}{36}=\dfrac{-5}{36}\)
21 tháng 5 2021
1. 3/5-5/6=-7/30
2.\(\dfrac{-5}{9}-\dfrac{-5}{12}=\dfrac{-5}{36}\)
27 tháng 10 2021
Bài 4:
b: Xét ΔAHB vuông tại H có HM là đường cao
nên \(AM\cdot AB=AH^2\left(1\right)\)
Xét ΔAHC vuông tại H có HN là đường cao
nên \(AN\cdot AC=AH^2\left(2\right)\)
Từ (1) và (2) suy ra \(AM\cdot AB=AN\cdot AC\)
27 tháng 10 2021
\(TanB=\dfrac{AC}{AB}\Rightarrow Tan30^o=\dfrac{AC}{4,5}\Rightarrow AC=Tan30^o.4,5=\dfrac{3\sqrt{3}}{2}\left(m\right)\)
\(CosB=\dfrac{AB}{BC}\Rightarrow Cos30^o=\dfrac{4,5}{BC}\Rightarrow BC=Cos30^o.4,5=\dfrac{9\sqrt{3}}{4}\)
Chiều cao ban đầu của cây tre là: \(\dfrac{3\sqrt{3}}{2}+\dfrac{9\sqrt{3}}{4}=\dfrac{15\sqrt{3}}{4}\approx6,5\left(m\right)\)
16 tháng 2 2020
đầu bài là như này đúng không hả bạn
\(\frac{1}{2}+\frac{2}{3}:\left(x-1\right)\)\(=\frac{3}{4}\)
16 tháng 2 2020
Ta có :\(\frac{1}{2}+\frac{2}{3}:\left(x-1\right)\)\(=\frac{3}{4}\)
\(\frac{2}{3}:\left(x-1\right)\)\(=\frac{1}{4}\)
\(\left(x-1\right)\)\(=\frac{8}{3}\)
\(x=\frac{11}{3}\)
12 tháng 6 2023
3/25 x ( 15/7 - 2/7 ) + 3/7 x 1/25
= 3/25 x 13/7 + 3/7 x 1/25
= (3 x 13/7 + 3/7 ) x 1/25
= 42/7 x 1/25
= 6 x 1/25
= 6/25
Y
12 tháng 6 2023
\(\dfrac{3}{25}\times\dfrac{15}{7}+\dfrac{3}{7}\times\dfrac{1}{25}-\dfrac{2}{7}\times\dfrac{3}{25}\)
\(=\dfrac{3}{25}\times\left(\dfrac{15}{7}-\dfrac{2}{7}\right)+\dfrac{3}{7}\times\dfrac{1}{25}\)
\(=\dfrac{3}{25}\times\dfrac{13}{7}+\dfrac{3}{7}\times\dfrac{1}{25}\)
\(=\dfrac{3\times13}{25\times7}+\dfrac{3\times1}{7\times25}\)
\(=\dfrac{39}{175}+\dfrac{3}{175}\)
\(=\dfrac{39+3}{175}\)
\(=\dfrac{42}{175}\)
\(=\dfrac{6}{25}\)
31 tháng 12 2021
Exercise 1: Chuyển các câu sau sang thể bị động.
1.The waiter brings me this dish.
=> This dish is brought to me by the waiter.
2. Our friends send these postcards to us.
=> These postcards are sent to us by our friends.
3. Their grandmother told them this story when they visited her last week.
=> This story was told to them by their grandmother when they visited her last week.
4. Tim ordered this train ticket for his mother.
=> This train ticket was ordered for Tim’s mother.
5. She showed her ticket to the airline agent.
=> Her ticket was shown to the airline agent.
6. Jim baked this cake yesterday.
=> This cake was baked by Jim yesterday.
7. They are going to buy a new apartment next year.
=> A new apartment is going to be bought next year.
8. The shop assistant handed these boxes to the customer.
=> These boxes were handed to the customer by the shop assistant.
9. The board awarded the first prize to the reporter.
=> The first prize was awarded to the reporter by the board.
10. Have you sent the Christmas cards to your family?
=> Have the Christmas cards been sent to your family?
11. The committee appointed Alice secretary for the meeting.
=> Alive secretary was appointed for the meeting by the committe.
12. Tom will give Anna a ride to school tomorrow.
=> Anna will be given a ride to school by Tom tomorrow.
13. They keep this room tidy all the time.
=> This room is kept tidy all the time.
14. We gave Ann some bananas and some flowers.
=> Some bananas and some flowers are given to Ann.
15. They moved the fridge into the living room.
=> The fridge was moved into the living room.
16. When will you do the work?
=> When will the work be done?
17. How are you going to deal with this problem?
=> How is this problem dealt with?
18. How do you spend this amount of money?
=> How is this amount of money spent?
19. I wonder whether the board of directors will choose Susan or Jane for the position.
=> I wonder whether Susan or Jane will be chosen for the position by the board of directors.
20. How did the police find the lost man?
=> How was the lost man found by the police?
29 tháng 9 2016
X^4+x^2+1
X^4+2x^2+1_x^2
=(x^2+1)^2-x^2
Hang dang thuc 3
=
29 tháng 9 2016
1
(x2-8)2+36
=x4-16x2+64+36
=x4+20x2+100-36x2
=(x2+10)2-(6x)2
HĐT số 3
các bạn giúp mình câu 1, 2, 3 với
AG
3
1 tháng 11 2017
y+y*1/3*9/2+y*7/2
y+y*3/2+y*7/2=252
y*(1+3/2+7/2)=252
y* 6 =252
y =252:6
y =42
4 tháng 11 2017
sai ngay bước đầu tiên nhưng cách làm sai phần đầu còn lại đúng