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\(\dfrac{1}{2}=\dfrac{15}{30};\dfrac{2}{3}=\dfrac{20}{30};\dfrac{3}{5}=\dfrac{18}{30}\)
a.\(\dfrac{17}{60}=\dfrac{17}{60}\)
\(\dfrac{4}{5}=\dfrac{4\times12}{5\times12}=\dfrac{48}{60}\)
b.\(\dfrac{5}{6}=\dfrac{5\times4}{6\times4}=\dfrac{20}{24}\)
\(\dfrac{9}{8}=\dfrac{9\times3}{8\times3}=\dfrac{27}{24}\)
c.\(\dfrac{1}{2}=\dfrac{1\times6}{2\times6}=\dfrac{6}{12}\)
\(\dfrac{2}{3}=\dfrac{2\times4}{3\times4}=\dfrac{8}{12}\)
\(\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12}\)
d.\(\dfrac{1}{2}=\dfrac{1\times6}{2\times6}=\dfrac{6}{12}\)
\(\dfrac{2}{3}=\dfrac{2\times4}{3\times4}=\dfrac{8}{12}\)
\(\dfrac{7}{12}=\dfrac{7}{12}\)
1/3 và 3/4
Ta có : \(\frac{1}{3}\)= \(\frac{1x4}{3x4}\)=\(\frac{4}{12}\)
\(\frac{3}{4}\)= \(\frac{3x3}{4x3}\)= \(\frac{9}{12}\)
a)\(\frac{1}{3}\)= \(\frac{1x4}{3x4}\)= \(\frac{4}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)= \(\frac{9}{12}\)
b) \(\frac{3}{2}\)=\(\frac{3x21}{2x21}\)=\(\frac{63}{42}\)
\(\frac{2}{3}\)=\(\frac{2x14}{3x14}\)=\(\frac{28}{42}\)
\(\frac{5}{7}\)=\(\frac{5x6}{7x6}\)=\(\frac{30}{42}\)
a: 1/3=20/60
1/4=15/60
4/5=48/60
b: 1/2=6/12
2/3=8/12
3/4=9/12
Bài 3 :
a: \(MSC:12\\ \dfrac{4}{3}=\dfrac{4\times4}{3\times4}=\dfrac{16}{12};\dfrac{3}{4}=\dfrac{3\times3}{3\times4}=\dfrac{9}{12}\)
b: \(MSC:12\\ \dfrac{5}{4}=\dfrac{5\times3}{4\times3}=\dfrac{15}{12};\dfrac{5}{6}=\dfrac{5\times2}{6\times2}=\dfrac{10}{12}\)
c:\(MSC:24\\ \dfrac{3}{8}=\dfrac{3\times3}{8\times3}=\dfrac{9}{24};\dfrac{1}{6}=\dfrac{1\times2}{6\times2}=\dfrac{2}{12}\)
d: \(MSC:35\\ \dfrac{2}{5}=\dfrac{2\times7}{5\times7}=\dfrac{14}{35};\dfrac{4}{7}=\dfrac{4\times5}{7\times5}=\dfrac{20}{35}\)
Bài 3:
a: 4/3=16/12
3/4=9/12
b: 5/4=30/24
5/6=20/24
c: 3/8=18/48
1/6=8/48
d: 2/5=14/35
4/7=20/35
Bài 4:
a: 7/12=28/48
5/48=5/48
b: 4/100=4/100
8/25=32/100
\(\frac{1}{2}=\frac{1\times15}{2\times15}=\frac{15}{30}\)
\(\frac{2}{3}=\frac{2\times10}{3\times10}=\frac{20}{30}\)
\(\frac{1}{5}=\frac{1\times6}{5\times6}=\frac{6}{30}\)
Vậy quy đồng mẫu số ba phân số \(\frac{1}{2};\frac{2}{3}\)và \(\frac{1}{5}\)ta được ba phân số mới là \(\frac{15}{30};\frac{20}{30}\)và \(\frac{6}{30}\)
_HT_
1/2=1*3*5 / 2*3*5 = 15/30
2/3=2*2*5 / 2*3*5 = 20/30
1/5=1*2*3 / 2*3*5 = 6/30
→1/2 = 15/30 ; 2/3 = 20/30 ; 1/5 = 6/30
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