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

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

admin2022-07-21  32
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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