AJUDEM NESSAS 4 CONTAS É PARA AMANHÃ ,ALGUEM ?
A) -(-0,12ab²)(1,3ab³-ab²+4,2ab³-4,2a²b³)
B) (21ab²).(-12ab+1,3ab³-7,6ab^4)
C) -(3,2ax²) (-2,1ax²+3,8abc)
D) (-1,2ab) (+4,1acb+20axb)
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