1. Today is the fifth day.

2.  Half an hour has thirty minutes.

1) Our house has yard.                                                 \(\Rightarrow\)          Our house don't have yard.

2) There is a park near the hotel.                                \(\Rightarrow\)           There isn't a park near the hotel.

3) She live in a house near a lake.                              \(\Rightarrow\)           She doesn't live in a house near a lake.

4) Her brother and sister play sports after lunch.         \(\Rightarrow\)          Her brother and sister don't play sports after lunch.

sao lại 2 go nhỉ

me

câu 1;

  a. Chiều dài hình CN la: 24:(3-5).3=36

       chiều rộng hình CN là: 36+24=60

     Chu vi CN là: (36+60).2= 192

   b.Diện tích hình CN là: 60.36= 2160

\(2x\left(x-\frac{1}{7}\right)=0\)

\(\Rightarrow\begin{cases}2x=0\\x-\frac{1}{7}=0\end{cases}\)\(\Leftrightarrow\begin{cases}x=0\\x=\frac{1}{7}\end{cases}\)

Vậy \(x=0\) hoặc \(x=\frac{1}{7}\)

\(\frac{4}{5}-\frac{3}{2}\cdot x=\frac{7}{15}\)

\(\frac{3}{2}\cdot x=\frac{4}{5}-\frac{7}{15}\)

\(\frac{3}{2}\cdot x=\frac{1}{3}\)

\(x=\frac{1}{3}:\frac{3}{2}\)

\(x=\frac{2}{9}\)

Vậy \(x=\frac{2}{9}\)

\(2\frac{1}{3}\cdot3=7\)

{2;5} {3;6;7}