Bài 2: Quy đồng mẫu số các phân số sau:
b.1/2;5/4 và 12/10Hãy 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: \(1-\frac{2012}{2013}=\frac{1}{2013}\)
\(1-\frac{2013}{2014}=\frac{1}{2014}\)
mà \(\frac{1}{2013}>\frac{1}{2014}\) nên \(\frac{2013}{2014}>\frac{2012}{2013}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a: 3/4=54/72
-1/9=-8/72
-5/8=-45/72
b: -1/7=-8/56
-1/-8=1/8=7/56
3/4=42/56
![](https://rs.olm.vn/images/avt/0.png?1311)
bài3
1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)
2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)
\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)
3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)
\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)
4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: 1/3=20/60
1/5=12/60
1/12=5/60
b: 1/3=16/48
1/12=4/48
1/48=1/48
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: 1/3=20/60
1/5=12/60
1/12=5/60
b: 1/3=16/48
1/12=4/48
1/48=1/48
Bài 2:
a: 1/3=20/60
1/5=12/60
1/12=5/60
b: 1/3=16/48
1/12=4/48
1/48=1/48
![](https://rs.olm.vn/images/avt/0.png?1311)
A\(\frac{2}{5}=\frac{14}{35}\) \(\frac{4}{7}=\frac{20}{35}\)
B\(\frac{5}{6}=\frac{40}{48}\) \(\frac{9}{8}=\frac{54}{48}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3}{5}=\frac{3\times8}{5\times8}=\frac{24}{40}\)
\(\frac{3}{8}=\frac{3\times5}{8\times5}=\frac{15}{40}\)
\(\frac{3}{10}=\frac{3\times4}{10\times4}=\frac{12}{40}\)
\(\frac{3}{2}=\frac{3\times20}{2\times20}=\frac{60}{40}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3}{5}=\frac{24}{40};\frac{3}{8}=\frac{15}{40};\frac{3}{10}=\frac{12}{40};\frac{3}{2}=\frac{60}{40}\)
\(\frac{3}{5}=\frac{3\times8}{5\times8}=\frac{24}{40}\)
\(\frac{3}{8}=\frac{3\times5}{8\times5}=\frac{15}{40}\)
\(\frac{3}{10}=\frac{3\times4}{10\times4}=\frac{12}{40}\)
\(\frac{3}{2}=\frac{3\times20}{2\times20}=\frac{60}{40}\)
10/12 nhé
TL
\(b.\frac{1}{2};\frac{5}{4};\frac{10}{12}\left(MSC:96\right)\)
\(\frac{1}{2}=\frac{1x4x12}{2x4x12}=\frac{48}{96};\frac{5}{4}=\frac{5x2x12}{4x2x12}=\frac{120}{96};\frac{10}{12}=\frac{10x4x2}{12x4x2}=\frac{80}{96}\)
Vậy quy đồng mẫu số 3 phân số \(\frac{1}{2};\frac{5}{4};\frac{10}{12}\) ta được \(\frac{48}{96};\frac{120}{96};\frac{80}{96}\)
nha
_HT_