+ Câu bị động :

we should write a brochure about Hue Imperial Citadel  to prepare for our presentation

=>A brochure should be written about Hue Imperial Citadel by us to prepare for our presentation

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\(\left(\frac{x}{xy-y^2}+\frac{2x-y}{xy-x^2}\right):\left(\frac{1}{x}+\frac{1}{y}\right)\)

\(=\left(\frac{x}{y\left(x-y\right)}-\frac{2x-y}{x\left(y-x\right)}\right):\left(\frac{y}{xy}-\frac{x}{xy}\right)\)

\(=\left(\frac{x}{y\left(x-y\right)}+\frac{2x-y}{x\left(x-y\right)}\right):\left(\frac{y-x}{xy}\right)\)

\(=\left(\frac{x^2}{xy\left(x-y\right)}+\frac{\left(2x-y\right)y}{xy\left(x-y\right)}\right):\left(\frac{y-x}{xy}\right)\)

\(=\frac{x^2+2xy-y^2}{xy\left(x-y\right)}.\frac{xy}{-\left(x-y\right)}=\frac{x^2+2xy-y^2}{-\left(x-y\right)}\)

\(x^3+5x^2-4x-20=0\)

\(\Leftrightarrow x^2\left(x+5\right)-4\left(x+5\right)=0\)

\(\Leftrightarrow\left(x^2-4\right)\left(x+5\right)=0\)

\(\Leftrightarrow\left(x-2\right)\left(x+2\right)\left(x+5\right)=0\Leftrightarrow x=\pm2;-5\)

Rearrange the words and phrases to make meaningful sentences
1. an/pagoda/village/old/my/has.
- > My village has an old pagoda.
2.railway-station/not/small/a/that/town/has/got.
-> That town has not got a small railway- station.
3.one/Mr and Mrs. Brown/only/have/car/got.
-> Mr and Mrs Brown only have got one car.
4.building/school/new/has got/my/a.
-> My school has got a new building.
5.many/got/city/lakes/that/has/beautiful
-> That city has got many beautiful lakes.
6.Lodon/parks/has/famous/got/many
-> London has got many famous parks
7.any/city/museums/your/has/got?
-> Has your city got any museums?
8.art galleries/not/town/has/got/this/any
-> This town has not got any art galleries.
9.building/old/got/Hue/pagodas/and/many/has
-> Hue has got many old buildings and pagodas.
10.a/house/has/got/garage/your?
-> Has your house got a garage?

1. an/ pagoda/ village/old/ my has.

=> My village has an old pagoda.

2. railway-station/ not/small/ a/ that/ town/ has/ got.

=> That town has not got a small railway-station

3. one/ Mr. and Mrs. Brown/ only/ have/ car/ got.

=> Mr. and Mrs.Brown only have got one car.

4.building/ school/ new/ has got/ my/ a.

=> My new school has got a new building.

5. many/ got/ city/ lakes/ that/ has/ beautiful.

=> That city has got many beautiful lakes.

6. London/ park/ has/ famous/ got/ many

=> London has got many famous park.

7. any/ city/ museums/ your/ has/ got?

=> Has any museums in your city?

8. art gallaries/ not/ town/ has/ got/ this/ any

=>This town has not got any art gallaries.

9. buildings/ old/ got/ Hue/ pagodas/ and/ many/ has

=> Hue has got many old buildings and pagodas.

10. a/ house/ has/ got/ garage/ your?

=> Has your house got a garage?

mua luôn 16 cuộn dây điện?!

dời mấy vị trí??

a/ Ta có : -17 nhỏ hơn hoặc bằng x nhỏ hơn hoặc bằng 18 

=> x= -17+(-16)+(-15)+(-14)+...+17+18

=> x= (-17+17)+(-16+16)+...+(-1+1)+18

=> x= 0+0+0+...+0+18

=>x=18

b, Có: /x/ <25 

=> x= 0+1+2+...+24

Số số hạng của tổng x là : (24-0)+1=25 (số)

Tổng x là : 25.(24+0):2=300=> x=300

c, x+15=105+(-5)

x+15=100

x=85

d, x-73=(-35)+/-55/

x-73= -35+55

x-73=20

x=93

e, /x/+45 = /-17/+/-28/

/x/+45= 17+28

/x/+45=45

/x/=0  => x=0

thứ sáu

60 = 2² . 3 . 5

62 = 2 . 31

=> BCNN (60,62) = 2² . 3 . 5 . 31 = 31 . 60

=> Sau : 31 . 60 : 60 = 31 phút nữa cả hai máy cùng đổ chuông

Khi đó, thời gian là : 10 giờ + 31 phút = 10 giờ 31 phút