求解z=2x+3y^2则dz=多少?a,2dx+3y^2dy b.2dx+6ydy c.2xdx+6ydy d.2xdx+3y^2dy应选()
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求解z=2x+3y^2则dz=多少?a,2dx+3y^2dy b.2dx+6ydy c.2xdx+6ydy d.2xdx+3y^2dy应选()
求解z=2x+3y^2则dz=多少?
a,2dx+3y^2dy b.2dx+6ydy c.2xdx+6ydy d.2xdx+3y^2dy
应选()
求解z=2x+3y^2则dz=多少?a,2dx+3y^2dy b.2dx+6ydy c.2xdx+6ydy d.2xdx+3y^2dy应选()
δz/δx = 2x,δz/δy = 3*2y
dz = 2xdx+6ydy
全微分 dz =δz/δx * dx + δz/δy * dy
选 C
=2dx+3dy^2
求解z=2x+3y^2则dz=多少?a,2dx+3y^2dy b.2dx+6ydy c.2xdx+6ydy d.2xdx+3y^2dy应选()
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