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a)4/7 = 32/56
3/4 = 42/56
5/8 = 35/56
b)2/5 = 126/315
3/7 = 135/315
4/9 = 140/315
a) 4/7 ; 3/4 va 5/8 Mau so chung nho nhat la : 56
4/7 = 4 x8 / 7 x 8 = 32/56 ; 3/4 = 3 x 14 / 4 x 14 = 42/56 ; 5/8 = 5 x 7 / 8 x 7 = 35/56
b) 2/5 ; 3/7 va 4/9
2/5 = 2 x 7 x 9 / 5 x 7 x 9 = 126/315 ; 3/7 = 3 x 5 x 9 / 7 x 5 x 9 = 135/315 ; 4/9 = 4 x 5 x7 / 9 x 5 x 7 = 140/315
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.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
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
\(\dfrac{8}{20};\dfrac{35}{20}\)
\(\dfrac{3}{8};\dfrac{14}{8}\)
\(\frac{120}{160}\); \(\frac{120}{160}\) ; \(\frac{120}{160}\)