Điền từ giúp em với ạ, cảm ơn nhiều ạ :<

For years, comcern has been(1)........ by parents and teachers about the effect of computer games on the moral(2)....... make up of the next(3)........ Some have warned that a relentless diet of whiz bang 'shoot em up' foster anticipate behavior,(4).......playground violence.(5)........believe that the age of the zoombie is upon us.
But expert opinion is(6)........ radically. Psychologists in America and Britain now suggest that(7)........ coputer games hold some dangers for children, they also provide opportunities their parents(8)........enjoyed to ampilify powers of concentration memory. reseachers(9)........ also highlighted the positive(10)........of children to the way computer games reward such thereby spurring(11)......... on to look for greater challenges a boon if the same attitude is applied to school(12)........ A leading academic at the University of Washington has even claimed that children think(13)........ when they play computer games, learning to deal with problems in parallel rather than in sequence. In(14) ........, children are being trained to tackle problems in a(15)....... which is not only more rapid but also more effective.

Bài 1: Tìm điều kiện xác định của các biểu thức sau:
A = √x3 2x2
D= √-x² + 6x-9+ √x-1
B = √2x-1 x2-5x+4
E= √x²+x-6 √x + 3
C = √x+2+√x² - 4
F= x+1 x2
Bài 2: Tìm điều kiện xác định và phân tích các biểu thức sau thành nhân tử:
G=x-2√x-3
H=x+3√x+2
I = x√x+y√y
K =x-y-2√x+4√y-3
Bài 3: Tìm các giá trị x trong các trường hợp sau:
a. x2 = 7
b. (x + 2)² = 11
e. √x2+1=3
f. √3x²+1=7
c. 2(√x-3)2-5=0
g. √x² + 2√3 =1+ √3 V
d. (x² - 4)² = 9
h. √4x2 = 1-x
Bài 4: Tìm điều kiện xác định và rút gọn biểu thức: M = <+ √x+ + √x + x 2