lấy máy tính ra bấm là nó ra liền à

\(\frac{-35}{280}=\frac{\left(-35\right):35}{280:35}=\frac{-1}{8}\)     

\(\frac{24}{72}=\frac{24:24}{72:24}=\frac{1}{3}\)

\(\frac{15}{-105}=\frac{-15}{105}=\frac{\left(-15\right):15}{105:15}=\frac{-1}{7}\)

\(\frac{36}{240}=\frac{36:12}{240:12}=\frac{3}{20}\)

\(\frac{125}{1000}=\frac{125:125}{1000:125}=\frac{1}{8}\)

\(\frac{198}{126}=\frac{198:18}{126:18}=\frac{11}{7}\)

\(\frac{3}{243}=\frac{3:3}{243:3}=\frac{1}{81}\)

\(\frac{103}{3090}=\frac{103:103}{3090:103}=\frac{1}{30}\)

\(\frac{252525}{535353}=\frac{252525:10101}{535353:10101}=\frac{25}{53}\)

\(\frac{25.9-25.17}{-8.80-8.10}=\frac{25.\left(9-17\right)}{-8.\left(80+10\right)}=\frac{25.\left(-8\right)}{\left(-8\right).90}=\frac{5}{18}\)

a, 24/40 = 3/5

\(a,\frac{6}{10}=\frac{3}{5};\frac{6}{16}=\frac{3}{8};-\frac{15}{20}=\frac{3}{4};-\frac{10}{30}=\frac{-1}{3}\)

\(b,\frac{42}{28}=\frac{3}{2};\frac{54}{-21}=-\frac{10}{7};-\frac{27}{33}=-\frac{9}{11};\frac{25}{14}=\frac{25}{14}\)

\(c,\frac{125}{1000}=\frac{1}{8};\frac{198}{126}=\frac{11}{7};\frac{3}{243}=\frac{1}{81};\frac{103}{2090}=\frac{103}{2090}\)

\(d,\frac{2.3}{9.14}=\frac{28}{3}\)

Đây có phải phân số đâu bạn?

a: 90/126=5/7<6/7

b: 70/84=5/6

35/42=5/6

=>70/84=35/42

a)\(\dfrac{90}{126}=\dfrac{5}{7}< \dfrac{6}{7}\Leftrightarrow\cdot\dfrac{90}{126}< \dfrac{6}{7}\)

b)\(\dfrac{70}{84}=\dfrac{5}{6};\dfrac{35}{42}=\dfrac{5}{6}\Leftrightarrow\cdot\dfrac{70}{84}=\dfrac{35}{42}\)

\(\dfrac{7}{11}\)

\(\dfrac{7}{11}\)

ng rút được nữa vì phân số đã tối giản, nếu rút thì sẽ ra số thập phân

\(\dfrac{126}{165}=\dfrac{126:3}{165:3}=\dfrac{42}{15}=\dfrac{42:3}{15:3}=\dfrac{14}{5}\)

14/5

7/42= 1/6

1/6

1/6