=>x-2=0 hoặc x-3=0

=>x=2 hoặc x=3

(3/5:2/25)^15-5

2 - 2 - 2 + 2  = 0

2 : 2 - 2 + 2 = 1

2 x 2 - 2 + 2 = 3

2 x 2 x 2 :  2 = 4

2 : 2 +  2 + 2 = 5

2 x 2 x 2  x 2 = 6

..

2 x 2 x  2 +  2 = 10

a)2²+2.2.y+y²=(2+y)²

^b)(2y)²-2.2.y+1²=(2y-1)²

3) The teacher said :" You may come in Tom"

=> The teacher said .....................................................................

2)Lily said: " My aunt doesn't know whereI an now"

=>lily said ..........................................................................

1) Thanh said:" All the students will have a meeting tonight"

=> Thanh said .....................................................................

2)Lan said: " T live here with my parents"

=>Lan said ..........................................................................

1)ĐKXĐ:x khác 2

2)ĐKXĐ:x khác -5 và -1

3)ĐKXĐ:x khác 2 và 3

4)ĐKXĐ:x khác -1 và 3

b)461-78+40-461

=(461-461)-(78-40)

=-38

b)53-76-(-76+53)

=53-76+76-53

=0