若du(x，y)=[axy3+cos(x+2y)]dx+[3x2y2+bcos(x+2y)]dy，则a=，b=．

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问题若du(x，y)=[axy³+cos(x+2y)]dx+[3x²y²+bcos(x+2y)]dy，则a=________，b=________．

选项

答案2，2

解析

3axy²-2sin(x+2y)=6xy²-bsin(x+2y)
比较系数得a=2，b=2．

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考研数学三

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