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15 - 4 + 3 - 12 +10 + 5 +4 - 5 + 10 - 8= 18
El B)
3 - 8 + 5 + 2 = 2
El C)
5 - 6 + 2 + 1 + 8 + 3 - 6 + 5= 12
El D)
(9 x - 2)/ 6 = - 3
El E)
(-32 + 27) al cuadrado = 25
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