Resuelve los siguientes ejercicios de multiplicación de números racionales:
6/20 x 4/15=?

3/5 x (-10/4) x 8/9= ?

8/3 x 15/40=?

12 x (-20/18) x 1/5=?

resuelve los siguientes ejercicios de divicion de números racionales :

-4/9: (-5/3)=?

12/44 : 11/22=?

15 : (-3/5=?

-2/5 : (-4)=?

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