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\(=\dfrac{70}{105};\dfrac{42}{105};\dfrac{30}{105};\dfrac{63}{105};\dfrac{45}{105};\dfrac{75}{105}\)
\(\dfrac{30}{105}< \dfrac{42}{105}< \dfrac{45}{105}< \dfrac{63}{105}< \dfrac{70}{105}< \dfrac{75}{105}\) hay \(\dfrac{2}{7}< \dfrac{2}{5}< \dfrac{3}{7}< \dfrac{3}{5}< \dfrac{2}{3}< \dfrac{5}{7}\)
=> 5/6; 4/5; 2/3; 7/12; 1/2
1/2 ; 4/5 ; 2/3 ; 5/6 ; 7/12
Khi quy đồng ta có: 30/60; 48/60; 40/60; 50/60; 35/60
Ta có:
\(\dfrac{6}{5}=\dfrac{6\times168}{5\times168}=\dfrac{1008}{840}\) ; \(\dfrac{3}{4}=\dfrac{3\times210}{4\times210}=\dfrac{630}{840}\) ; \(\dfrac{9}{8}=\dfrac{9\times105}{8\times105}=\dfrac{945}{840}\)
\(\dfrac{1}{7}=\dfrac{1\times120}{7\times120}=\dfrac{120}{840}\) ; \(\dfrac{2}{3}=\dfrac{2\times280}{3\times280}=\dfrac{560}{840}\)
⇒ \(\dfrac{120}{840}< \dfrac{560}{840}< \dfrac{630}{840}< \dfrac{945}{840}< \dfrac{1008}{840}\) ⇒ \(\dfrac{1}{7}< \dfrac{2}{3}< \)\(\dfrac{3}{4}< \dfrac{9}{8}< \dfrac{6}{5}\)
\(\dfrac{2}{3};\dfrac{3}{4};\dfrac{5}{6};\dfrac{11}{12}\)