Huy Tú's Profile

=X+ 2x+1/x+1

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

=X^3+2X

GTLN =/0

=>2^3=8

( 2x - 1 )^3 = 64

<=> 2x - 1 = 4 

<=> 2x = 5 <=> x = 5/2

Ta có : y = f(x) =  2x - 3 

f(1) = 2.1 - 3 = 2 - 3 = -1

f(2) = 2.2 - 3 = 4 - 3 = 1

x-2/x-3 = x/x+2

<=> (x-2).(x+2) = x.(x-3)

<=> x^2 - 4 = x^2 - 3x

<=> x^2 - x^2 - 4 =-3x

<=> 4 = 3x

<=> x= 4/3

a) = 9+ ( - 12 )= - ( 12 -9 ) = - 3

b) [( -15) + ( -5)] + ( 29+11)= -20 + 40= 40 - 20= 20

c)= ( 4.25 ) . (125.8) . 9=100 . 1000 . 9= 100000 . 9=900000

d ) = 36 . ( 15 + 85 )= 36 . 100= 3600

e) [25 +(-19) ] + 25= [+ (25-19 )] + 25= 6 + 25= 31

f)=+ ( 15-12 )= 3

Ta có : (1+y)+(2+y)+(3+y)+...+(99+y)+(100+y)

= 6050(1+2+3+..+99+100)+(y+y+y+...+y+y)

=6050(1+2+3+..+99+100)+(y+.100)

=60505050+(y.100)

=6050y.100=6050-5050y.100

=1000y

=1000:100

y = 10

Đặt x^2 = t ( t >= 0 )

Phương trình

<=> t^2 +4t + 5 = 0

Ta có : 16 - 20 = -4 < 0

Vậy phương trình vô nghiệm

42 . n - 3.24 = 24.22

16 . n - 3 . 16 = 16 . 4

16 . ( n - 3 ) = 64 

n-3 = 64 : 16

n -3 = 4

n = 4 + 3

n =7

Some people say that there shouldn't be examinations but i don't agree about this problem. i think, nowadays, students go to school not only study for their selves, they also study for many diffrent things.Firstly, if there are many examinations from schools, students will have to study hard in order to pass those examinations and affirm their learning so they will try and exert all one's strengthSencondly, examinations help students recognize of learning by their selvesThirdly, examinations help student know things they are bad and things they need to try better and continue to study harder .Therefore, there should be examinations because this is the best way to estimate student's learning and help students study better.

Ta có M = 2009.2010+2020

N = 2009.2011-2019

N= 2009.2010+2009-2009

N = 2009.2010+(2009-2009)

N = 2009.2010 +0 => M>N