20/31 > 19/33
12/33 < 13/15
45/46 < 46/47
mik ko biet co dung ko nhung dung thi duoc con ko thi thui...
\(\frac{20}{31}>\frac{19}{33}\)
\(\frac{12}{33}< \frac{13}{15}\)
\(\frac{45}{46}>\frac{46}{47}\)
vì 19/31<20/31 ma 19/31 >19/33 suy ra 20/31.19/33
mấy câu tiếp cũng vậy