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Bài 2:
a: 5/4<7/4
b: 2/3=34/51
9/17=27/51
mà 34>27
nên 2/3>9/17
Bài 3:
a: 1/3+3/8=8/24+9/24=17/24
b: 7/6+5/18=21/18+5/18=26/18=13/9
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) \(\dfrac{3}{7};\dfrac{4}{9};\dfrac{8}{21}\) MSC: 63
\(=>\dfrac{3}{7}=\dfrac{27}{63};\dfrac{4}{9}=\dfrac{28}{63};\dfrac{8}{21}=\dfrac{24}{63}\)
b) \(\dfrac{4}{11};\dfrac{5}{12};\dfrac{3}{4}\) MSC: 132
\(=>\dfrac{4}{11}=\dfrac{48}{132};\dfrac{5}{12}=\dfrac{55}{132};\dfrac{3}{4}=\dfrac{99}{132}\)
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
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