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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.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
quy đồng mấu số của các phân số
2/3 và 5/8 ; 1/4 và 7/12 ; 5/6 và 3/8
này dễ mong các cao nhân giúp:))
2/3 = 16/24 và 5/8 = 15/24 ; 1/4 = 3/12 và 7/12:5/6 = 20/24 và 3/8 = 9/24 cao nhân xuất hiện
\(a,\)\(\frac{2}{3}=\frac{2\times8}{3\times8}=\frac{16}{24}\)
\(\frac{5}{8}=\frac{5\times3}{8\times3}=\frac{15}{24}\)
\(b,\)\(\frac{1}{4}=\frac{1\times3}{4\times3}=\frac{3}{12}\)và \(\frac{7}{12}\)
\(c,\)\(\frac{5}{6}=\frac{5\times4}{6\times4}=\frac{20}{24}\)
\(\frac{3}{8}=\frac{3\times3}{8\times3}=\frac{9}{24}\)
\(\frac{5}{6}=\frac{20}{24}\); \(\frac{1}{4}=\frac{6}{24}\)
\(\frac{3}{5}=\frac{21}{35}\);\(\frac{3}{7}=\frac{15}{35}\)
\(\frac{9}{8}=\frac{81}{72}\);\(\frac{8}{9}=\frac{64}{72}\)
\(\frac{7}{5}=\frac{77}{55}\);\(\frac{8}{11}=\frac{40}{55}\)
\(\frac{5}{12}=\frac{10}{24}\);\(\frac{3}{8}=\frac{9}{24}\)
\(\frac{17}{10}=\frac{119}{70}\);\(\frac{9}{7}=\frac{90}{70}\)
Bài 2 :
a, 4/9;5/9;7/9;8/9.
b, 6/12;7/12;9/11;10/9
c, 3/7;5/8;2/3
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.\(\dfrac{1}{2}=\dfrac{1\times6}{2\times6}=\dfrac{6}{12}\)
\(\dfrac{2}{3}=\dfrac{2\times4}{3\times4}=\dfrac{8}{12}\)
\(\dfrac{7}{12}=\dfrac{7}{12}\)
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
2/3 và 5/8
\(\frac{2}{3}=\frac{2\cdot8}{3\cdot8}=\frac{16}{24}\)
\(\frac{5}{8}=\frac{5\cdot3}{8\cdot3}=\frac{15}{24}\)
1/4 và 7/12
\(\frac{1}{4}=\frac{1\cdot3}{4\cdot3}=\frac{3}{12}\)
\(\frac{7}{12}\)
5/6 và 3/8
\(\frac{5}{6}=\frac{5\cdot4}{6\cdot4}=\frac{20}{24}\)
\(\frac{3}{8}=\frac{3\cdot3}{8\cdot3}=\frac{9}{24}\)
2/3=2x8/3x8=16/24 1/4=1x12/4x12=12/48 5/6=5x8/6x8=40/48
5/8=5x3/8x3=15/24 7/12=7x4/12x4=28/48 3/8=3x6/8x6=18/48
HỌC TỐT NHA