Thiếu

a) |x| = 2,5

=>\(\left[\begin{array}{nghiempt}x=2,5\\x=-2,5\end{array}\right.\)

vậy x=2,5 hoặc x=-2,5

b)|x|=-1,2

=>x không có giá trị thỏa mãn |x|\(\ge\) 0

c)|x| + 0,573 = 2

|x| = 2 - 0,573

|x| = 1,427

=>\(\left[\begin{array}{nghiempt}x=1,427\\x=-1,427\end{array}\right.\)

Vậy x = 1,427 hoặc x = -1,427

d) ∣∣x+13∣∣ - 4 = -1

=>|x+\(\frac{1}{3}\)| =-1 + 4

|x+\(\frac{1}{3}\)| = 3

.....................

Vậy x = \(\frac{8}{3}\) hoặc x = \(\frac{-10}{3}\)

Lan always watch TV in the evening.

Many years ago, most people in Viet Nam didn't have TV sets.

sao lại giống mk thế nhỉ

kim ngưu

1)a)x²+10x+26+y²+2y

=(x²+10x+25)+(y²+2y+1)

=(x+5)²+(y+1)²

b)x²-2xy+2y²+2y+1

=(x²-2xy+y²)+(y²+2y+1)

=(x-y)²+(y+1)²

c)z²-6z+13+t²+4t

=(z²-6z+9)+(t²+4t+4)

=(z-3)²+(t+2)²

d)4x²+2z²-4xz-2z+1

=(4x²-4xz+z²)+(z²-2z+1)

=(2x-z)²+(z-1)²

2)a)(x-3)²-4=0

<=>(x-3-2)(x-3+2)=0

<=>(x-5)(x-1)=0

<=>x-5=0 hoặc x-1=0

<=>x=5 hoặc x=1

b)x²-2x=24

<=>x²-2x-24=0

<=>(x²-6x)+(4x-24)=0

<=>x(x-6)+4(x-6)=0

<=>(x-6)(x+4)=0

<=>x-6=0 hoặc x+4=0

<=>x=6 hoặc x=-4

tớ là cung kim ngưu nghe

Finding it easy to make friend do you

mk ko biết có làm đúng ko nữa

-15/12. x+3/7=6/5.x-1/2

=> -15/12  . x +3/7+1/2 = 6/5  .x

=> -15/12   .x + 13/14= 6/5  .x 

=>  49/20 .x = 13/14 => x= 130/343

3. Who is famous for the song Top of the World ?

A.Karen Catpenter

B. Celine Dion

C. Susan Boyle

4. Which of the following became a World Heritage in 2009 ?

A. Hat cheo

B. Cai luong

C. Quan ho Bac Ninh