-a2b²c²(a+b-c) =
Use distributive rule
a•(b+c) = ab + ac
Then
-a^2b^2c^2 •a= -a^3•b^2•c^2
-a^2b^2c^2 •b = -a^2•b^3•c^2
-a^2b^2c^2 •(-c)= a^2•b^2•c^3
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