So Sánh phân số 15/25 và 25/49
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có \(\dfrac{23}{27}>\dfrac{23}{29};\dfrac{23}{29}>\dfrac{22}{29}\)
Vậy \(\dfrac{23}{27}>\dfrac{22}{29}\)
b) Ta có \(\dfrac{15}{25}=1-\dfrac{2}{5}\)
\(\dfrac{25}{49}=1-\dfrac{24}{49}\)
Vì \(\dfrac{2}{5}=\dfrac{24}{60}< \dfrac{24}{49}\)
Vậy \(\dfrac{15}{25}>\dfrac{25}{49}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(\frac{12}{25}< \frac{12}{29}\)
\(\frac{12}{29}< \frac{25}{29}\)
=> \(\frac{12}{25}< \frac{12}{29}< \frac{25}{29}\)
Vậy \(\frac{12}{25}< \frac{25}{29}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(\frac{12}{25}< \frac{12}{24}=\frac{1}{2}\Rightarrow\frac{12}{25}< \frac{1}{2}\left(1\right)\)
\(\frac{25}{49}>\frac{25}{50}=\frac{1}{2}\Rightarrow\frac{25}{49}>\frac{1}{2}\left(2\right)\)
Từ \(\left(1\right)\)và\(\left(2\right)\)\(\Rightarrow\)\(\frac{12}{25}< \frac{1}{2}< \frac{25}{49}\)\(\Rightarrow\frac{12}{25}< \frac{25}{49}\)
NHỚ TK MK NHA
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(\frac{25}{12}>\frac{24}{12}=2\)
\(\frac{49}{25}< \frac{50}{25}=2\)
Vì \(\frac{25}{12}>2>\frac{49}{25}\) nên \(\frac{25}{12}>\frac{49}{25}\)
Chúc bạn học tốt!
Ta có :
\(\frac{15}{25}=\frac{15\times49}{25\times49}=\frac{735}{1225};\frac{25}{49}=\frac{25\times25}{49\times25}=\frac{625}{1225}\)
Vì 735 > 625 nên \(\frac{15}{25}>\frac{25}{49}\)