Bạn ấn\(fx\)là ra phân số mà.
Mình giải như sau:
\(\frac{228}{225}>\frac{2228}{2225}\)
\(\frac{36}{39}>\frac{35}{41}\)
nhé bạn
\(\frac{228}{225}>\frac{2228}{2225}\)
\(\frac{36}{39}>\frac{35}{41}\)
a) Ta có: \(\frac{228}{225}=\frac{225+3}{225}=1+\frac{3}{225}\)
\(\frac{2228}{2225}=\frac{2225+3}{2225}=1+\frac{3}{2225}\)
Vì \(225< 2225\)\(\Rightarrow\frac{1}{225}>\frac{1}{2225}\)\(\Rightarrow\frac{3}{225}>\frac{3}{2225}\)\(\Rightarrow1+\frac{3}{225}>1+\frac{3}{2225}\)
hay \(\frac{228}{225}>\frac{2228}{2225}\)
b) Ta có: \(\frac{36}{39}=\frac{12}{13}\); \(\frac{35}{41}< \frac{35}{40}=\frac{7}{8}\)( vì 41 > 40 )
Sos sánh \(\frac{12}{13}\)và \(\frac{7}{8}\)ta thấy:
\(\frac{12}{13}=\frac{13-1}{13}=1-\frac{1}{13}\)
\(\frac{7}{8}=\frac{8-1}{8}=1-\frac{1}{8}\)
Vì \(13>8\)\(\Rightarrow\frac{1}{13}< \frac{1}{8}\)\(\Rightarrow1-\frac{1}{13}>1-\frac{1}{8}\)
hay \(\frac{12}{13}>\frac{7}{8}\)\(\Rightarrow\frac{12}{13}>\frac{7}{8}>\frac{35}{41}\)
hay \(\frac{36}{39}>\frac{35}{41}\)