设二元函数z=xy+F(x+y),若当y=0,z(x,0)=ex,试求z的表述式.
设二元函数z=xy+F(x+y),若当y=0,z(x,0)=ex,试求z的表述式.
【正确答案】:因为y=0时,z=ex,把y=0代入z=xy+F(x+y),得ex=F(x),于是F(x+y)=ex+y,故z=xy+F(x+y)=xy+ ex+y
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