Question

KHÔNG QUY ĐỒNG MẪU SỐ HÃY SO SÁNH

\(\frac{12}{11}và\frac{20}{19}\)

Answer 1

\(\frac{12}{11}=1+\frac{1}{11}\)

\(\frac{20}{19}=1+\frac{1}{19}\)

Ta thấy \(\frac{1}{11}>\frac{1}{19}\Rightarrow1+\frac{1}{11}>1+\frac{1}{19}\)

\(\Rightarrow\frac{12}{11}>\frac{20}{19}\)

Answer 2

\(\frac{12}{11}=\frac{228}{209}\)

\(\frac{20}{19}=\frac{380}{209}\)

\(\Rightarrow\frac{228}{209}< \frac{380}{209}\Rightarrow\frac{12}{11}< \frac{20}{19}\)

Answer 3

Ta có :

\(\frac{12}{11}=\frac{12}{11}-1=\frac{1}{11}\)

\(\frac{20}{19}=\frac{20}{19}-1=\frac{1}{19}\)

Vì \(\frac{1}{11}>\frac{1}{19}\)nên\(\frac{2}{11}>\frac{20}{19}\)