1-B                              2-D                            3-B                             4-C                    5-C

thank

\(\left|2x+3\right|=x+2\)     (1)

\(\left|2x+3\right|=\orbr{\begin{cases}2x+3\Leftrightarrow x\ge-\frac{3}{2}\\-2x-3\Leftrightarrow x< -\frac{3}{2}\end{cases}}\)

Với \(x\ge-\frac{3}{2}\)\(\Rightarrow\)(1) trở thành:

\(2x+3=x+2\)

\(2x-x=2-3\)

\(x=-1\)( chọn )

Với \(x< -\frac{3}{2}\Rightarrow\)(1) trở thành:

\(-2x-3=x+2\)

\(-3-2=x+2x\)

\(3x=-5\)

\(x=-\frac{5}{3}\)( chọn )

Vậy \(\orbr{\begin{cases}x=-1\\x=-\frac{5}{3}\end{cases}}\)

Tham khảo nhé~

\(\left|2x+3\right|=x+2\)

Nếu \(2x+3\ge0\Leftrightarrow x\ge-\frac{3}{2}\)

\(\Rightarrow2x+3=x+2\)

\(2x-x=2-3\)

\(x=-1\left(TM\right)\)

Nếu \(2x+3< 0\Leftrightarrow x< -\frac{3}{2}\)

\(\Rightarrow2x+3=-x-2\)

\(2x+x=-2-3\)

\(3x=-5\)

\(x=-\frac{5}{3}\left(tm\right)\)

Vậy ....

help elephants

a) How interesting the movie is!

b) What a comfortable bed!

c) Wow! The car is so fast!

d) How beautiful the dress is! 

e) What a difficult test!

f) How awful the  weather is!

l) The cake is so delicous!

h) What a expensive picture!

g) How large the yard is!

x) What friendly boys!

PĐ : She wasn't very busy last week .

Nghi van : Did she very busy last week .

Em là học sinh lớp 6 =))

a) Địa y

b) Lâm tặc

c) Ngoại quốc

d) Hoàng thượng

e) Tâm phật

g) trung thành

h) thực hư

\(C=\frac{1}{100}-\left(\frac{1}{100.99}+\frac{1}{99.98}+...+\frac{1}{3.2}+\frac{1}{2.1}\right)\)

\(C=\frac{1}{100}-\left(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{99}-\frac{1}{100}\right)\)

\(C=\frac{1}{100}-\left(1-\frac{1}{100}\right)\)

\(C=\frac{1}{100}-\frac{99}{100}\)

\(C=-\frac{98}{100}=-\frac{49}{50}\)

\(C=\frac{1}{100}-\frac{1}{100.99}-\frac{1}{99.98}-\frac{1}{98.97}-...-\frac{1}{3.2}-\frac{1}{2.1}\)

   \(=\frac{1}{100}-\left(\frac{1}{100.99}+\frac{1}{99.98}+\frac{1}{98.97}+....+\frac{1}{3.2}+\frac{1}{2.1}\right)\)

    \(=\frac{1}{100}-\left(\frac{1}{100}-\frac{1}{99}+\frac{1}{99}-\frac{1}{98}+\frac{1}{98}-\frac{1}{97}+...+\frac{1}{3}-\frac{1}{2}+\frac{1}{2}-1\right)\)

      \(=\frac{1}{100}-\left(\frac{1}{100}-1\right)\)

      \(=1\)

hãy so sánh a/b,c/d với a+d/b+c nhé

mk viết nhầm

1. encourage

2. depress

3. donation

4. voluntarily