Ответ:
19ab(20a²-b²)+20ab(b²-19a²)=380a³b-19ab³+20ab³-380a³b=ab³;
ab³=10•(-27)=-270
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Ответ:
19ab(20a²-b²)+20ab(b²-19a²)=380a³b-19ab³+20ab³-380a³b=ab³;
ab³=10•(-27)=-270