A= | x+5| +2-x

Vì |x+5| >_ 0 với mọi x

=> |x+5| +2-x>_ 2-x

=> A >_ 2-x

=> Amin = 2-x <=> |x+5| = 0

=> x+5 = 0

=> x= -5

KL: Vậy Amin= 2-x <=> x= -5

Nửa chu vi là:

90 : 2 = 45 (m)

CD là:

45 : (3+2) x 3 = 27 (m)

CR là:

45  - 27= 18 (m)

Đ/S:...

Gọi x, y lần lượt là kích thước của 1 hình chữ nhật

Ta có: \(\frac{x}{3}=\frac{y}{2}=\frac{x+y}{3+2}=\frac{90:2}{5}=\frac{45}{5}=9\)

=> x = 9 . 3 = 27

     y = 9 . 2 = 18

Vậy chiều dài: 27 m

      chiều rộng: 18 m

bạn lên: thư viện đề thi là có ngay.

vào vn.đọc nha bn

k mk nhé

thank you nhìu nha

*snow white*

\(\frac{3x}{2}=\frac{49}{30}\)

3x = 49/15

x = 49/45

b) \(\frac{3x}{2}=-\frac{61}{30}\)

3x = -61/15

x = -61/45

\(\frac{3x}{2}=\frac{49}{30}\Rightarrow3x=\frac{49.2}{30}=\frac{49}{15}\Rightarrow x=\frac{49}{45}\)

\(\frac{3x}{2}=\frac{-61}{30}\Rightarrow3x=\frac{\left(-61\right).2}{30}=\frac{-61}{15}\Rightarrow x=\frac{-61}{45}\)

 I moved to Ho Chi Minh city in 2000.

> I have moved to Ho Chi Minh city since 2000

She began to learn Eng lish four  years ago

> She has learnt English for four years

They started pracing tennis when they were in high school

> They have practised tennis since they were in high school

They started to study French in 2004

> They have learnt French since 2004

I have moved to Ho Chi Minh city since 2000.

She has learnt English for four years.

They have practised tennis since they were in high school.

They have learnt French since 2004.

Tk cho mình nha ae!!!!!!!!!!!!!!!! Ai tk mình thì tk lại.