Question

    Bài 1 Tìm số tự nhiên x biết 

 a,  \(\frac{3}{x}\)> \(\frac{3}{5}\) 

 
b,  \(\frac{1}{5}\)< \(\frac{x}{5}\)

Answer 1

a,x=4;3;2;1

b,x=2;3;4;5;6;7...

hk tốt

Answer 2

x =1

x=2

x=3

x=4

Answer 3

\(a)\) ĐKXD : \(x\ne0\)

Ta có : 

\(\frac{3}{x}>\frac{3}{5}\)

\(\Leftrightarrow\)\(x< 5\)

Vậy \(x< 5\)

\(b)\) \(\frac{1}{5}< \frac{x}{5}\)

\(\Leftrightarrow\)\(1< x\)

\(\Leftrightarrow\)\(x>1\)

Vậy \(x>1\)

Chúc bạn học tốt ~ 

Answer 4

a)\(\frac{3}{x}\)>\(\frac{3}{5}\)

\(\Rightarrow\){x < 5 / x\(\inℕ\)}\(\)

\(\Rightarrow\)x = {1; 2; 3; 4}

b)\(\frac{1}{5}\)<\(\frac{x}{5}\)

\(\Rightarrow\){x > 1/ x\(\inℕ\)}

\(\Rightarrow\)x {2; 3; 4; 5; 6; 8; ......}