[考古]
1. 2 2 2
x,y,z are positive number find the minimum of (x +1)(y +1)(z +1)
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xyz
2.
calculate
2 2 2
S (5+x y)dS,where C is the upper half of the unit circle x +y = 1
C
3.
find an equation of the tangent plane to the graph of
2 2 2
x -4y +z =16 at(2,-1,4)
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