a: =3/2+4/3
=9/6+8/6=17/6
b: =8/3-11/7
=56/21-33/21=25/21
c: =8/3*21/4=168/12=14
d: \(=\dfrac{7}{2}:\dfrac{9}{4}=\dfrac{7}{2}\cdot\dfrac{4}{9}=\dfrac{14}{9}\)
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giúp vs ạ
Giúp mik vs ạ!