Sao mấy bạn không tìm 1 hướng giải khác tốt hơn nhỉ ??? Ví dụ như so sánh với số trung gian
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Ta thấy :
\(\frac{-13}{38}< \frac{-13}{39}=\frac{-1}{3}=\frac{-29}{87}< \frac{-29}{88}\)
Vậy \(\frac{-13}{38}< \frac{-29}{88}\)
\(-\frac{13}{38}=\)\(-\frac{1144}{3344}\)
\(-\frac{29}{88}\)\(=-\frac{1102}{3344}\)
\(-\frac{1102}{3344}\)\(>\)\(-\frac{1144}{3344}\)
\(=>-\frac{29}{88}\)\(>-\frac{13}{38}\)
So sánh phân số: \(\frac{-13}{38}\)và\(\frac{29}{-88}\)
Ta có:
\(\frac{-13}{38}=\frac{\left(-13\right).44}{38.44}=\frac{-572}{1672}\)
\(\frac{29}{-88}=\frac{\left(-29\right).19}{88.19}=\frac{-551}{1672}\)
Mà: \(-572< -551\)
\(\Rightarrow\frac{-572}{1672}< \frac{-551}{1672}\Rightarrow\frac{-13}{38}< \frac{29}{-88}\)
ta có :
\(-\frac{13}{38}< -\frac{13}{39}=-\frac{1}{3}=-\frac{29}{87}< -\frac{29}{88}=\frac{29}{-88}\)
vậy \(-\frac{13}{38}< \frac{29}{-88}\)
