3a^2-a(3a-5b)-b(2a-b)^2化简

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3a^2-a(3a-5b)-b(2a-b)^2化简3a^2-a(3a-5b)-b(2a-b)^2化简3a^2-a(3a-5b)-b(2a-b)^2化简3a^2-a(3a-5b)-b(2a-b)^2=3

3a^2-a(3a-5b)-b(2a-b)^2化简
3a^2-a(3a-5b)-b(2a-b)^2化简

3a^2-a(3a-5b)-b(2a-b)^2化简
3a^2-a(3a-5b)-b(2a-b)^2
=3a²-3a²+5ab-4a²b+4ab²-b³
=5ab-4a²b+4ab²-b³

3a^2-a(3a-5b)-b(2a-b)^2
=3a^2-3a^2+5ab-b(4a^2-4ab+b^2)
=5ab-4a^2b+4ab^2-b^3
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