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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.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
a: \(MSC:24\\ \dfrac{1}{3}=\dfrac{1\times8}{3\times8}=\dfrac{8}{24};\dfrac{1}{4}=\dfrac{1\times6}{4\times6}=\dfrac{6}{24}\)
b: \(MSC:24\\ \dfrac{5}{12}=\dfrac{5\times2}{12\times2}=\dfrac{10}{24};\dfrac{7}{6}=\dfrac{7\times4}{6\times4}=\dfrac{28}{24}\)
a) \(\dfrac{4}{7}và\dfrac{5}{6}\)⇔ \(\dfrac{24}{42}và\dfrac{35}{42}\)
b) \(\dfrac{5}{14}và\dfrac{3}{8}\)⇔ \(\dfrac{20}{56}và\dfrac{21}{56}\)
c) \(\dfrac{9}{10}và\dfrac{7}{5}\)⇔ \(\dfrac{9}{10}và\dfrac{14}{10}\)
d) \(\dfrac{3}{5};\dfrac{5}{6}và\dfrac{7}{30}\)⇔ \(\dfrac{18}{30};\dfrac{25}{30}và\dfrac{7}{30}\)
a) \(\dfrac{6}{7}=\dfrac{6\times11}{7\times11}=\dfrac{66}{77}\) ; \(\dfrac{5}{11}=\dfrac{5\times7}{11\times7}=\dfrac{35}{77}\)
b) \(\dfrac{5}{9}=\dfrac{5\times5}{9\times5}=\dfrac{25}{45}\) ; \(\dfrac{9}{5}=\dfrac{9\times9}{5\times9}=\dfrac{81}{45}\)
c) \(\dfrac{3}{8}=\dfrac{3\times3}{8\times3}=\dfrac{9}{24}\) ; \(\dfrac{5}{24}\) giữ nguyên phân số
d) \(\dfrac{6}{5}=\dfrac{6\times6}{5\times6}=\dfrac{36}{30}\) ; \(\dfrac{5}{6}=\dfrac{5\times5}{6\times5}=\dfrac{25}{30}\)
\(#Wendy.Dang\)
a) 6/7 và 5/11
ta có :
6/7=66/77
5/11=35/77
b)5/9 và 9/5
ta có
5/9=25/45
9/5=81/45
C)3/8 và 5/24
ta có :
3/8=9/24
5/24
D)6/5 và 5/6
ta có
6/5=36/30
5/6=25/30
a: 5/6=25/30
9/30=9/30
b: 7/8=49/56
5/7=40/56
c: 2/9=4/18
5/18=5/18
d: 3/10=6/20
1/4=5/20
5/6=25/30
9/30=9/30
7/8=49/56
5/7=40/56
2/9=4/18
5/18=5/18
3/10=6/20
1/4=5/20
\(\dfrac{4}{5};\dfrac{5}{6}\) và \(\dfrac{6}{7}\)
Mẫu số chung: 210
Ta có:
\(\dfrac{4}{5}=\dfrac{4\times42}{5\times42}=\dfrac{168}{210}\)
\(\dfrac{5}{6}=\dfrac{5\times35}{6\times35}=\dfrac{175}{210}\)
\(\dfrac{6}{7}=\dfrac{6\times30}{7\times30}=\dfrac{180}{210}\)