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=3×20/4
=60/4
=15
1/2 de 80
=1×80/2
=80/2
=40
→15y40
Vamos paso a paso
Solo hay que multiplicar el número por la fracción
3/4 x 20 = 3x20/4 = 60/4 = 15
1/2 x 80 = 80/2 = 40
ALTERNATIVA B)