10-(5-x)=30+(2x-3)

10-5+x=30+2x-3

5+x=27+2x

x-2x=27-5

-x=22

x=-22

Cảm ơn bạn Thùy Trang

thi hả :)?

lần sau bạn nhớ tách câu ra nha... nhiều câu quá nhiều bạn ko trả lời hết...

Sách vien nha

\(8,\Rightarrow\left(x-\dfrac{1}{2}\right)^3=\dfrac{3}{8}-\dfrac{1}{2}=-\dfrac{1}{8}=\left(-\dfrac{1}{2}\right)^3\\ \Rightarrow x-\dfrac{1}{2}=-\dfrac{1}{2}\Rightarrow x=0\\ 11,\Rightarrow\left(x-2\right)\left(2-x\right)=33\left(-297\right)\\ \Rightarrow\left(x-2\right)^2=9801\Rightarrow\left[{}\begin{matrix}x-2=99\\x-2=-99\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=101\\x=-97\end{matrix}\right.\)

8) \(\Rightarrow\left(x-\dfrac{1}{2}\right)^3+\dfrac{1}{2}=\dfrac{3}{8}\)

\(\Rightarrow\left(x-\dfrac{1}{2}\right)^3=-\dfrac{1}{8}\)

\(\Rightarrow x-\dfrac{1}{2}=-\dfrac{1}{2}\Rightarrow x=0\)

11) ĐK: \(x\ne2\)

\(\Rightarrow\left(x-2\right)\left(2-x\right)=-297.33\)

\(\Rightarrow-x^2+4x-4=-9801\)

\(\Rightarrow-\left(x-101\right)\left(x+97\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x=101\left(tm\right)\\x=-97\left(tm\right)\end{matrix}\right.\)

help meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

\(a,=-x^2+x+4x-4=\left(x-1\right)\left(4-x\right)\\ b,=x^2\left(x+y\right)-y^2\left(x+y\right)=\left(x-y\right)\left(x+y\right)^2\)

Where is he?

Why is he sad?

What is that?

When is the exam?

Who is she?

Why is he happy?

Where are they?

Who is crying?

When is your birthday?

Who makes dinner?

Why are you running?

Where is Jack?

trên xuống dưới và trái qua phải
where        why
what          when
who           why
what          when
where        who
where        what
when         who
why           where

4:

a: OA<OB

=>A nằm giữa O và B

=>OA+AB=OB

=>AB=2cm

b: AO<AC

=>O nằm giữa A và C

mà AO=1/2AC

nên O là trung điểm của AC