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23 tháng 9 2020

 mn ơi \(2ab=200+ab\) nha không phải \(2\cdot ab\)

23 tháng 9 2020

làm :                                                                                                                                                                                                                  

\(\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}+\frac{1}{6\cdot7}+\frac{1}{7\cdot8}\)

\(=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}\)

\(=\frac{1}{2}-\frac{1}{8}\)

\(=\frac{3}{8}\)

b, \(ab\cdot10-ab=2ab\)

\(ab\cdot10-ab\cdot1=2ab\)

\(ab\cdot\left(10-1\right)=2ab\)

\(ab\cdot9=2ab\)

\(ab\cdot9=200+ab\cdot1\)

\(ab\cdot9-ab\cdot1=200\)

\(ab\cdot\left(9-1\right)=200\)

\(ab\cdot8=200\)

\(ab=200:8\)

\(ab=25\)

23 tháng 9 2020

\(\left(x-1\right)^5=-32\)

\(\left(x-1\right)^5=\left(-2\right)^5\)

\(x-1=-2\)

\(x=-2+1\)

\(x=-1\)

Ex 1, Write the sentences in the passvie1, (The politician/ interview/ now) ..........................2, (The Mona Lisa/ paint/ Leonardo da Vinci) ..........................3, (My flat/ buger/ last night) ..........................4, (All the tickets/ sell/ before we got there) ..........................5, (The dog/ not feed/ yet) ..........................6, (The prizes/ award/ president/ tomorrow ..........................7, (Tea/ grow/ India) ..........................Ex 2, Rewrite the...
Đọc tiếp

Ex 1, Write the sentences in the passvie
1, (The politician/ interview/ now) ..........................
2, (The Mona Lisa/ paint/ Leonardo da Vinci) ..........................
3, (My flat/ buger/ last night) ..........................
4, (All the tickets/ sell/ before we got there) ..........................
5, (The dog/ not feed/ yet) ..........................
6, (The prizes/ award/ president/ tomorrow ..........................
7, (Tea/ grow/ India) ..........................
Ex 2, Rewrite the sentences in the passvie voice
1, She cleans the office every evening at 5:00

..........................

2, Volunteers are planting trees in the forest
..........................

3, They hold the Summer Olympics every four years
..........................

4, did they discover America in 1942?
..........................
5, They have closed the road due to an oil spill
..........................

6, He sent the party invitations yesterday afternoon
.......................... 

7, They will arward him a Nobel prize

..........................

8, Has she watered the plants?
..........................
9, They saw a dolphin sWimming in the sea

..........................

10, You should handle this package carefull
..........................

11, They include tax in the bill
..........................

Ex 3, Complete the sentences
1, It is said the children were the cause of the damage

The children ..........................
2, He is considered to be the best football player in the country
It ..........................
3, They believe that he attened the weeding 
He ..........................
4, The news presenter reported that the criminal has escaped
The criminal ..........................
5, People think that he stole the paintings
He ..........................
6, He is said to have lived in France last year 
It ..........................
7, The company is thought to be losing a lot of money
It ..........................
Ex 4, Put the verbs in brackets into the correct passive tense
The remains of an Anglo-Saxon ship were discovered by archaeologists digging on the Kent coast last week. As was common in Anglo-Saxon England, it 2, .......................... (think) that the ship 3, .......................... (bury) alongside a great warrior. Although none of the original  wood from the ship remains, many items, including weapons and helmets 4, .......................... (find). These finds 5, .......................... (now/examine) by the experts at the University of Kent. Afterwards the items 6, .......................... (clean) so that they car 7, .......................... (dispaly) in the British Museum in London.
Cácc cậu ơi giúp tớ với tớ cần gấpp lắm lắm

1

Ex 1, Write the sentences in the passvie

5, (The dog/ not feed/ yet)

=> The dog haven't been felt yet

6, (The prizes/ award/ president/ tomorrow 

=> The prizes will be award by president tomorrow

.7, (Tea/ grow/ India)

=> The Tea is grown in India

Ex 2, Rewrite the sentences in the passvie voice

1, She cleans the office every evening at 5:00ư

=> The office is cleaned every evening at 5pm

2, Volunteers are planting trees in the forest

=> trees in the forest are being planted by Volunteers 

3, They hold the Summer Olympics every four years

=>  the Summer Olympics are held  every four years

8 tháng 10 2024

Viết đoann văn 200 cảm nhận về nhân vật cô trong truyện ngắn Khi Người Ta Trẻ

23 tháng 9 2020

VÌ 1 tháng sau thì xi măng đã khô lại và có thể giẫm lên đc, trước đây, mẹ bảo ko đc giẩm vào viên gạch ấy là vì xi măng chưa khô, nếu giẫm lên thì sẽ hỏng hết xi măng.

23 tháng 9 2020

Nhớ K cho mk đấy nhé, cảm ơn.

23 tháng 9 2020

Một liên đội có khoảng 200 đến 300 đội viên.Mỗi lần xếp hàng 3,hàng 5 ,hàng 7 thì vừa đủ. Tính số đội viên

23 tháng 9 2020

Vẽ phân giác BD, ta có: \(\frac{DA}{DC}=\frac{BA}{BC}\)

\(\Rightarrow\frac{DA}{AB}=\frac{DC}{BC}=\frac{DA+DC}{AB+BC}=\frac{AC}{AB+BC}\left(1\right)\)

Mặt khác \(\Delta ABD\)vuông tại A, ta có:

\(\tan\widehat{ABD}=\tan\frac{\widehat{ABC}}{2}=\frac{DA}{AB}\left(2\right)\)

Từ (1) và (2) =>đpcm

23 tháng 9 2020

a) Bảng lập phưng các số tự nhiên từ 0 đến 10 



b) Theo bảng trên ta có: 27 = 33; 125 = 53; 216 = 63.