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9 tháng 12 2021

lời hứa của bố, mẹ

9 tháng 12 2021

trong mơ nha bạn

Ta có : 

x/x^2 + x + 1 = -2/3

<=> -2x^2 - 2x - 2 = 3x

<=> -2x^2 - 5x - 2 = 0 

<=> -2(x^2 + 5/2x + 1) = 0 

<=> x^2 + 5/2x + 1 = 0

<=> x^2 + 2x.5/4 + 25/16 - 9/16 = 0 

<=> (x+5/4)^2 = 9/16

<=> x + 5/4 = 3/4 hoặc x + 5/4 = -3/4

<=> x = -1/2 hoặc x = -2

Sau đấy thay vào ( easy )

Ta có : 

x/x^2 + x + 1 = -2/3

<=> -2x^2 - 2x - 2 = 3x

<=> -2x^2 - 5x - 2 = 0 

<=> -2(x^2 + 5/2x + 1) = 0 

<=> x^2 + 5/2x + 1 = 0

<=> x^2 + 2x.5/4 + 25/16 - 9/16 = 0 

<=> (x+5/4)^2 = 9/16

<=> x + 5/4 = 3/4 hoặc x + 5/4 = -3/4

<=> x = -1/2 hoặc x = -2

Sau đấy thay vào ( easy )

9 tháng 12 2021

    135x(5x3)

=135x5x135x3

=........................................

tự tính

9 tháng 12 2021

258 nha!
Học tốt nha em!

9 tháng 12 2021

258 nha

9 tháng 12 2021

ai giúp mình với !

DD
10 tháng 12 2021

Số ngày để ba bạn cùng đến thư viện là bội chung của \(4,6,9\).

Mà số ngày là ít nhất nên số ngày đó là \(BCNN\left(4,6,9\right)\).

Phân tích thành tích các thừa số nguyên tố: \(4=2^2,6=2.3,9=3^2\)

Suy ra \(BCNN\left(4,6,9\right)=2^2.3^2=36\)

Vậy sau ít nhất \(36\)ngày thì ba bạn lại cùng đến thư viện, và đó là ngày \(27/12/2007\).

Beatrice had had a number of jobs, none of them for very long. She had been a bus conductor ……1…… one time, then a postman, and ...... 2...... she had cleaned the floors in a supermarket. Usually she left the job when she got ......3...... of it. Sometimes she was sacked. Then one day she saw an ……4…… for a job ……5…… a canal warden. She applied ……6…… the job, just because it sounded interesting, ……7……she had no idea……8……a canal warden did....
Đọc tiếp

Beatrice had had a number of jobs, none of them for very long. She had been a bus conductor ……1…… one time, then a postman, and ...... 2...... she had cleaned the floors in a supermarket. Usually she left the job when she got ......3...... of it. Sometimes she was sacked.

Then one day she saw an ……4…… for a job ……5…… a canal warden. She applied ……6…… the job, just because it sounded interesting, ……7……she had no idea……8……a canal warden did. Surprisingly, she ……9…… the job, and started work a few days ……10…… As ……11…… as she could see, her duties were to ……12…… an official cap and coat, and walk ……13…… the banks of the canal, enjoying the fresh air.

……14…… days when it rained, she ……15……. sit in a cafe nearby and watch the canal ……16……there. She ……17…… us it was the best job she had ever had.

Giúp với mình sắp phải nộp rồi

It was too good to …… 18……  of course. One day, she fell into the canal and shouted …… 19……  help. A fellow warden arrived …… 20……  find some passers - by pulling her out. The news that she could not swim …… 21……a shock to her employers. They said her main purpose was rescuing people …… 22……  fell into the canal. She says she never knew that. She also says they never asked her ……23…… she could swim. Anyway, she had to start looking for …… 24……  job. She says that she might still have been a canal warden if it had not ……25…… for falling into the canal that day.

0
9 tháng 12 2021
2,6:(3,7-x)=1 3,7-x =2,6÷1 3,7-x =2,6 x =3,7-2,6 x =1,1 Nhớ tick cho mình nha😊
9 tháng 12 2021
Thanks bạn nha