4x²Y-(6X³+6XY²-2X²Y)+(2Y²X+6X³+6)
=4x²Y-6X³-6XY²+2X²Y+2Y²X+6X³+6
=6X²Y-4XY²+6
（X²-Y²）-（2X²-3Y）
=X²-Y²-2X²+3Y
=-X²-Y²-3Y
4x²Y-(6X³+6XY²-2X²Y)+(2Y²X+6X³
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