Explicación paso a paso:
a. 48 - 20 = 68
b. 4 - 19 = - 15
c. - 28 - 40 = - 68
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Explicación paso a paso:
a. 48 - 20 = 68
b. 4 - 19 = - 15
c. - 28 - 40 = - 68