Diga a qual Propriedade da multiplicação pertencem as alternativas abaixo.

a) (7.8).9=7.(8.9)

b) 31.1=31

c) 6.6 -¹=1

d) 8.(3+x)=8.3+8.x

e) w.(A+B)=w.a+w.b

f) a.(-a) = -a.a
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