Question

So sánh các số hữu tỉ sau bằng cách nhanh nhất 

  a/ \(\frac{-1}{5}\) và \(\frac{1}{1000}\)

 b/ \(\frac{267}{-268}\)và \(\frac{-1347}{1343}\)

 c/ \(\frac{-13}{38}\)và \(\frac{29}{-88}\)

 d/ \(\frac{-18}{31}\)và \(\frac{-181818}{313131}\)

Answer 1

\(\text{a)}\frac{-1}{5}< 0< \frac{1}{1000}\Rightarrow\frac{-1}{5}< \frac{1}{1000}\)

\(\text{b)}\frac{-267}{268}>-1>\frac{-1347}{1343}\Rightarrow\frac{267}{268}>\frac{-1347}{1343}\)

\(\text{c)}\frac{-13}{38}>\frac{-13}{39}=\frac{-1}{3}=\frac{29}{-87}>\frac{29}{-88}\Rightarrow\frac{-13}{38}>\frac{29}{-88}\)

\(\text{d)}\frac{-18}{31}=\frac{\left(-18\right).10101}{31.10101}=\frac{-181818}{313131}\Rightarrow\frac{-18}{31}=\frac{-181818}{313131}\)

Answer 2

Sai chỗ nào T.T

Answer 3

\(\text{à phần c :)}\text{ sửa: }\)

\(\frac{-13}{38}< \frac{-13}{39}=\frac{-1}{3}=\frac{29}{-87}< \frac{29}{-88}\Rightarrow\frac{-13}{38}< \frac{29}{-88}\)