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[主观题]
设f(x,y)是可微函数,且f(0,0)=0,fx(0,0)=a,fy(0,0)=b.令φ(t)=f(t,f(t,t)),则φ'(0)=(). A.a B.a+b(a
设f(x,y)是可微函数,且f(0,0)=0,fx(0,0)=a,fy(0,0)=b.令φ(t)=f(t,f(t,t)),则φ'(0)=( ).
A.a B.a+b(a+b) C.a+1 D.
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A.a B.a+b(a+b) C.a+1 D.
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