Trong không gian Oxyz, cho hai mặt phẳng (P): x - 2y - z + 3 =0, (Q): 2x + y + z - 1= 0, . Mặt phẳng R đi qua điểm M(1;1;1) và chứa giao tuyến của (P) và (Q); phương trình của (R): m.(x-2y-z+3) + (2x+y+z-1). Khi đó giá trị của m là

A. 3

B.  1 3

C.  - 1 3

D. 3

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

A. contractual                   

B. personality                

C. apologize                   

D. commitment

On Mother's Day, sons and daughters visit their mother and bring them flowers and presents. The oldest son must give his mother a good cake. If sons or daughters can not be with their mother on that day, they usually send her presents.

Mother's Day must be a day of rest for the mother of family, so her daughters cook the dinner on that day and lay the table and the sons help to wash the dishes after dinner.

In the United States and Canada, Mother's Day is the second Sunday in May. They have a very beautiful stamp for Mother's Day in the United States .

It shows the portrait of the mother of James Whistler , one of the greatest American painters.

=> Would you like to have dinner at my house tonight ?

Sao ko có SNSD ?