设(ay-2xy2)dx+(bx2y+4x+3)dy为某个二元函数的全微分,则a=________,b=________.

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问题 设(ay-2xy2)dx+(bx2y+4x+3)dy为某个二元函数的全微分,则a=________,b=________.

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答案a=4,b=-2

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