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a) 3/4 de 19/15 :
3/4 × 19/15 = 57/60 = 19/20 = 0.95 => Rta
b) 1/2 de 7/15 :
1/2 × 7/15 = 7/30 = 0.23 => Rta
c) 4/9 de 9/21:
4/9 × 9/21 = 36/189 = 4/21 = 0.19 => Rta
d) 4/7 de 11/18:
4/7 × 11/18 = 44/126 = 22/63 = 0.35 => Rta
e) 17/19 de 3/17:
17/19 × 3/17 = 51/323 = 3/19 = 0.16 => Rta
f) 8/3 de 1/2:
8/3 × 1/2 = 8/6 = 4/3 = 1.3 => Rta
Espero que te ayude.
Saludos!!!