4x²-6x-12xy+18y=________
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4x²-6x-12xy+18y=________4x²-6x-12xy+18y=________4x²-6x-12xy+18y=________=-40.04929124
4x²-6x-12xy+18y=________
4x²-6x-12xy+18y=________
4x²-6x-12xy+18y=________
=-40.0492912457