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2.--8[(3-4)+3(7+5)] =-8[(-1)+3(12)] =-8[(-1)+36]=-8[35]=-280
3.-1/6[(1/4 al cuadrado +3/5*1/4)] = 1/6[(1/16 +3/20)]=1/6[(17/80]=17/480
4.- -8 al cuadrado [(7+9)] = 64[(16)] =1024