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x,y是实数,且“xy>0”是“|x+y|=|x|+|y|”的 ( )

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f(x,y)=3(x+y)+32xy  f(x,y)=3(x+y)-32xy  f(x,y)=3(x+y)-16xy  f(x,y)=3(x+y)+16xy  
X与X+Y一定相关.  X与X+Y一定不相关.  X与XY一定相关.  X与XY一定不相关.  
f(x,y)=3(x+y)-32xy  f(x,y)=3(x+y)-16xy  f(x,y)=3(x+y)+32xy  f(x,y)=3(x+y)+16xy  
f(x,y)=3(x+y)+32xy  f(x,y)=3(x+y)-32xy  f(x,y)=3(x+y)-16xy  f(x,y)=3(x+y)+16xy  
f(xy)=f(x)f(y)   f(xy)=f(x)+f(y)   f(x+y)=f(x)f(y)   f(x+y)=f(x)+f(y)  
f(x,y)=3(x+y)+32xy  f(x,y)=3(x+y)-32xy  f(x,y)=3(x+y)-16xy  f(x,y)=3(x+y)+16xy  
exy[xsin(x+y)-cos(x+y)]  exy[xsin(x+y)+cos(x+y)]  exy[xsinxy+cos(x+y)]  exy[ysin(x+y)+xcos(x+y)]  
f(x,y)=3(x+y)+32xy  f(x,y)=3(x+y)-32xy  f(x,y)=3(x+y)-16xy  f(x,y)=3(x+y)+16xy  
x>0,y>0   x<0,y<0   x>0,y<0   x<0,y>0  
exy[xsin(x+y)-cos(x+y)]  exy[xsin(x+y)+cos(x+y)]  exy[xsinxy+cos(x+y)]  exy[ysin(x+y)+xcos(x+y)]  
f(x,y)=3(x+y)+32xy  f(x,y)=3(x+y)-32xy  f(x,y)=3(x+y)-16xy  f(x,y)=3(x+y)+16xy  
f(x,y)=3(x+y)+32xy  f(x,y)=3(x+y)-32xy  f(x,y)=3(x+y)-16xy  f(x,y)=3(x+y)+16xy  
f(xy)=f(x)f(y)  f(xy)=f(x)+f(y)   f(x+y)=f(x)f(y)  f(x+y)=f(x)+f(y)  
exy[xsin(x+y)-cos(x+y)]  exy[xsin(x+y)+cos(x+y)]  exy[xsinxy+cos(x+y)]  exy[ysin(x+y)+xcos(x+y)]  
10<X+Y<100 And X-Y<0  X+Y>10 And X+Y<100 And X-Y<0  X+Y>10 And X+Y<100 Or X-Y<O  X+Y>10 Or X+Y<100 Or X-Y<0  

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