a) Quy đồng mẫu số:
\(\frac{12}{49}=\frac{12.47}{49.47}=\frac{564}{2303}\)
\(\frac{13}{47}=\frac{13.49}{47.49}=\frac{637}{2303}\)
\(\Rightarrow\frac{564}{2303}< \frac{637}{2303}\left(564< 637\right)\)
hay \(\frac{12}{49}< \frac{13}{47}\)
b) Quy đồng mẫu số:
\(\frac{456}{461}=\frac{456.128}{461.128}=\frac{58368}{59008}\)
\(\frac{123}{128}=\frac{123.461}{128.461}=\frac{56703}{59008}\)
\(\Rightarrow\frac{58368}{59008}>\frac{56703}{59008}\left(58368>56703\right)\)
hay ;\(\frac{456}{461}>\frac{123}{128}\)
c) Quy đồng mẫu số:
\(\frac{64}{85}=\frac{64.81}{85.81}=\frac{5184}{6885}\)
\(\frac{73}{81}=\frac{73.85}{81.85}=\frac{6205}{6885}\)
..............
Đag mắc đi hc
