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已知两曲线y=f(x)与在点(0,0)处的切线相同,写出此切线方程,并求极限.
已知两曲线y=f(x)与在点(0,0)处的切线相同,写出此切线方程,并求极限
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已知两曲线y=f(x)与在点(0,0)处的切线相同,写出此切线方程,并求极限
.
已知两曲线y=f(x)与在点(0,0)处的切线相同,则极限
=().
A.-1
B.1
C.-1/2
D.1/2
E.-2
设证明f(x,y)在点(0,0)处连续,f'(0,0)与f'y(0,0)也存在,但是f(x,y)在点(0,0)处不可微分
设函数,证明f(x,y)在点(0,0)处连续,但f'(0,0)与f'y(0,0)都不存在
已知f(x)在[a,b]上连续,在(a,b)内f"(x)存在,设连结A(a,f(a)),B(b,f(b))两点的直线与曲线y=f(x)在异于A,B点的另一点C(c,f(c))处相交,c∈(a,b),试证在(a,b)内至少有一点ξ,使f"(ξ)=0.