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a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
câu a bằng 15/8
câu b bằng 19/6
câu c bằng 3/10
câu d bằng 27/4
\(\dfrac{1}{2}\times\dfrac{3}{4}:\dfrac{6}{5}=\dfrac{3}{8}:\dfrac{6}{5}=\dfrac{5}{16}\)
\(\dfrac{2}{3}+\dfrac{1}{6}:\dfrac{7}{12}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{14}{21}+\dfrac{6}{21}=\dfrac{20}{21}\)
\(8\times\dfrac{3}{5}:\dfrac{12}{5}=\dfrac{24}{5}:\dfrac{12}{5}=2\)
\(\dfrac{4}{9}+\dfrac{3}{4}-\dfrac{1}{3}=\dfrac{16}{36}+\dfrac{27}{36}-\dfrac{12}{36}=\dfrac{31}{36}\)
a: 4/3=32/24
5/8=15/24
b: 4/5=36/45
5/9=25/45
c: 4/9=16/36
7/12=21/36
d: 1/2=6/12
2/3=8/12
7/12=7/12
4/3 và 5/8
\(\dfrac{4}{3}=\dfrac{4x8}{3x8}=\dfrac{32}{24}\)
\(\dfrac{5}{8}=\dfrac{5x3}{8x3}=\dfrac{15}{24}\)
4/5 và 5/9
\(\dfrac{4}{5}=\dfrac{4x9}{5x9}=\dfrac{36}{45}\)
\(\dfrac{5}{9}=\dfrac{5x5}{9x5}=\dfrac{25}{45}\)
4/9 và 7/12
\(\dfrac{4}{9}=\dfrac{4x12}{9x12}=\dfrac{48}{108}\)
\(\dfrac{7}{12}=\dfrac{7x9}{12x9}=\dfrac{63}{108}\)
1/2 ; 2/3 và 7/12
\(\dfrac{1}{2}=\dfrac{1x6}{2x6}=\dfrac{6}{12}\)
\(\dfrac{2}{3}=\dfrac{2x4}{3x4}=\dfrac{8}{12}\)
\(\dfrac{7}{12}=\dfrac{7x1}{12x1}=\dfrac{7}{12}\)
a: \(=\dfrac{1}{2}\cdot\dfrac{3}{4}\cdot\dfrac{5}{6}=\dfrac{15}{48}=\dfrac{5}{16}\)
b: \(=\dfrac{2}{3}+\dfrac{12}{42}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{20}{21}\)
c: \(=\dfrac{24}{5}\cdot\dfrac{5}{12}=2\)
d: \(=\dfrac{1}{9}+\dfrac{3}{4}=\dfrac{4+27}{36}=\dfrac{31}{36}\)
a: =5/4-3/4=2/4=1/2
b: =30/45-18/45=12/45=4/15
c: =10/12-9/12=1/12
d: =4/3-1/4=16/12-3/12=13/12
= ( 1/4 + 3/4 ) + ( 9/12 + 3/12 )
= 1 + 1 = 2
=2 nha