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1.馥郁fùyù
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2.()" f( y) de(B)dy"f(x y)dr(C). dr, f (x, y)dy(D)dxf (, y)
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3.y(k)+y(k-1)y(k-2)=f(k)
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4.设f(x y,xy)=x2 Y2,则f(x,y)=( )
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5.( ) = ò ò y y dx y x
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6.(3) f(x, y,z)= ry y = l,x y z= 0.
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7.设f(x)=∫x- y|sin√ydy,求f(x)
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8.Assume that Z(t) = X(t) + Y(t), where X(t) and Y(t) are jointly stationaryrandom processes,then Sz(f)
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9.If f (x, y) has two local maxima, then f must have a local minimum.
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10.Let F (x, y) = x2y 3y.