Explicación paso a paso:
Cálculo mental es 2.5+2.5+2.5+2.5=10,1.5+1.5+1.5-1.5=4.5, 2.5+2.5+2.5+2.5+2.5=12.5, 1.5+1.5+1.5-1.5-1.5=3
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Explicación paso a paso:
Cálculo mental es 2.5+2.5+2.5+2.5=10,1.5+1.5+1.5-1.5=4.5, 2.5+2.5+2.5+2.5+2.5=12.5, 1.5+1.5+1.5-1.5-1.5=3