(+20) - (+20)
(-9) - (+3)
(-12) - (+21)
(-40) - (-25)
(5) - (5)
(-9) - (+3)
(-12) - (+21)
(-40) - (-25)
(5) - (5)
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Respuesta:
(+20) - (+20) = 20 - 20 = 0
(-9) - (+3) = - 9 - 3 = - 12
(-12) - (+21) = - 12 - 21 = - 33
(-40) - (-25) = - 40 - 25 = - 65
(5) - (5) = 5 - 5 = 0