A={0}

x là số tự nhiên mà ko thuộc N* thì chỉ có thể là 0

\(\Rightarrow\frac{2}{5}:x=\frac{2}{3}-\frac{4}{7}\)

\(\Rightarrow\frac{2}{5}:x=\frac{7}{6}\)

\(\Rightarrow x=\frac{2}{5}:\frac{7}{6}\)

\(\Rightarrow x=\frac{12}{35}\)

tíc mình nha

Gọi 3 số tự nhiên liên tiếp là a,a+1,a+2

Theo đề bài ta có

(a+1)(a+2)=a(a+1)+192

=>a²+2a+a+2=a²+a+192

=>(a²-a²)+2a=(a-a)+(192-2)

=>2a=190

a=95

a+1=96

a+2=97

3 số tự nhiên liên tiếp là 95;96;97

1." will you be free tomrrow?" She said to me

-> She asked me ....................

2. They have just built a new bridge in the area.

-> A new bridge ...............................

3. I last saw Peter when we attended the school meeting.

-> I haven't............................

4. The boy was too tired to keep on walking

-> They boy was so ................

Câu 1: Phát âm

1, A.runs B. stands C. sleeps D.sprays

2, A.enjoyed B. walked C. watched D.practiced

3, A.occasion B. collection C. opinion D.pagoda

4, A.earthquake B. ethnic C. weather D.health