Câu hỏi của đinh văn tiến d

Question

Akai Haruma · Accepted Answer

Bài 1:

a.

$7< 8\Rightarrow \frac{7}{13}< \frac{8}{13}$

$\Rightarrow \frac{7}{-13}> \frac{8}{-13}$

b.

$\frac{-9}{-31}=\frac{9}{31}> 0> \frac{10}{-31}$
c.

$17< 18\Rightarrow \frac{17}{50}< \frac{18}{50}$
$\Rightarrow \frac{-17}{50}> \frac{-18}{50}$ hay $\frac{-17}{50}> \frac{18}{-50}$

Câu trả lời:

Bài 1:

a.

$7< 8\Rightarrow \frac{7}{13}< \frac{8}{13}$

$\Rightarrow \frac{7}{-13}> \frac{8}{-13}$

b.

$\frac{-9}{-31}=\frac{9}{31}> 0> \frac{10}{-31}$
c.

$17< 18\Rightarrow \frac{17}{50}< \frac{18}{50}$
$\Rightarrow \frac{-17}{50}> \frac{-18}{50}$ hay $\frac{-17}{50}> \frac{18}{-50}$

Akai Haruma · Answer

Bài 2:

a.

$\frac{1111}{3131}=\frac{1111:101}{3131:101}=\frac{11}{31}$
b.

$\frac{1313}{1818}=\frac{1313:101}{1818:101}=\frac{13}{18}=\frac{13.10101}{18.10101}=\frac{131313}{181818}$

c.

$\frac{101010}{212121}=\frac{101010:10101}{212121:10101}$

$=\frac{10}{21}$

$\frac{1010}{2121}=\frac{1010:101}{2121:101}=\frac{10}{21}$

$\Rightarrow \frac{101010}{212121}=\frac{1010}{2121}$