Dũng mạnh nhấtvàhoàng yếu nhaats

Tìm x,y,z ∈Z sao cho :

1)xy+x+y=3

*HD: ( xy+x )+y=3

x.(y+1)+y=3

x.(y+1)+(y+1)=4

(y+1)+(x+1)=4=1.4=.....

TH:.....

2)xy+2x-2y=5

3) xy+2x+2y= -1

4) xy-2x-2y = -3

5) 2xy-x+y = 3

6) 3xy+2x-y = 2 ( HD:nhân 2 vế với 3)

Giúp mình với...Các bạn làm tương tự theo hướng dẫn câu 1 đc k ạ ? Mong mọi người giúp !!!

Ai làm xong mình sẽ tick nhé !

Write a paragraph about to tell about your feeling after your visit to the capital

Giúp mình với...Ai xong trc mình tick nhé

Cảm ơn trước !!!

Rewrite the following sentences.

Giúp mình vs....Ai giải đc trong 30 p nx mình sẽ tick nhé...Cảm ơn trc !!!

Rewrite the following sentences.

1) It was very crazy of Nam to HCM City alone by motor

Nam.......................................................................................

2) It is careless of Long to break things often

Long........................................................................

3) It is too fool of Thanh to be treated many times

Thanh............................................................

4) All every one at the party were frightened when the police cam in

It............................................................

5) Barack Obama was so friendly to shake Vietnamese's hands and eat in a food stall in HN

It................................................................................

Ai trả lời nhanh nhất mình sẽ tick nha...Cảm ơn trước

Tính nhanh :\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{1225}\)\

Giúp mình với....chiều phải nộp bài r