a. +21/10
Calculo:
5/2 -2/5= 25/10 -4/10= +21/10
b.+61/20
15/4 -7/10= 75/20 -14/20= +61/20
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a. +21/10
Calculo:
5/2 -2/5= 25/10 -4/10= +21/10
b.+61/20
Calculo:
15/4 -7/10= 75/20 -14/20= +61/20