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(填空题) 曲线在点(1,2)处的切线斜率是______.
(填空题) 曲线在点(1,2)处的切线斜率是______.
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(填空题) 曲线在点(1,2)处的切线斜率是______.
求函数在点M(1,2,-2)处沿曲线x=t,y=2t2,z=2t4在该点的切线方向的方向导数.
曲线y=ax2+bx上点(1,2) 处切线的倾斜角为45°,则a=______,b=______.
求函数z=ln(x+y)在抛物线y2=4x上点(1,2)处,沿着这抛物线在该点处偏向x轴正向的切线方向的方向导数.