※ 引述《puppy110330 (慵懶的葉子)》之銘言：
: 1.use the double integral to find the volume of tetrahedron bounded by the
: planes x+y+z=1 x=0 y=0 z=0
: 2.let F(x.y)=ln(y/x) find themaximum value of directional derivative of f
: at the point (4.2)
: 3.find the limit lim(1/n+1 + 1/n+2 +...........+ 1/n+n)
: n->00
: 4.the tangent line of F(x.y)=x^3-2x^2+x+1 is parallel to y=5x+3
: at x=?
: 5.a linear approximation of f(x)=(x+3)^1/2 at a=1 is??????
2.Let u be a unit vector , we have
-∥DelF(x,y)∥ <= F'(x,y) <= ∥DelF(x,y)∥ for all directions u .
u
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