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Suma : -1+4-27+256= 232
a1=(-1)^1= -1
a2=(-2)^2= 4
a3=(-3)^3= -27
a4=(-4)^4= 256
Sa1,a2,a3,a4= a1+a2+a3+a4= -1+4+(-27)+256=232
S=232 ;)