B(a(a-b)-b(a+b))-a(b(a-b)-a(a+b))

1. Who came late last night? 2. Where do fish live? 3. What have I sent her? 4. Why did we buy some fruit and cakes? 5. What time do I get up early?

b(a(a-b)-b(a+b))-a(b(a-b)-a(a+b))=b(a²-ab-ab-b²)-a(ab-b²-a²-ab)==ab²-2ab-b³-a²b+ab²+a³+a²b=2ab²-2ab-b³+a³

напишу кратко.b(a^2-ab-ab-b^2)-a(ab-b^2-a^2-ab)=a^2-ab^2-ab^2-b^3-a^2b+ab^2+a^3+a^2b=a^2b-ab^2-b^3+a^3