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已知f(x,y)=3x+2y,求f[xy,f(x,y)]
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已知f(x,y)=3x+2y,求f[xy,f(x,y)]
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答案和解析
f(x,y)=3x+2y
则:
f(xy,f(x,y))=3(xy)+2f(x,y)=3xy+2(3x+2y)=3xy+6x+4y
则:
f(xy,f(x,y))=3(xy)+2f(x,y)=3xy+2(3x+2y)=3xy+6x+4y
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