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X+Y=600,X:Y=,X=   ,Y=   .

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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  
2x2y3+y+3xy  2x2y2﹣2y+3xy  2x2y3+2y﹣3xy  2x2y3+y﹣3xy  
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  
若X→Y,Y→Z,则X→Z  若X→Y,X→Z,则X→YZ  若X→Z,则XY→Z  若XY→Z,则X→Z,Y→Z  
xy(2x-2y)2   2xy(x-y)2   4xy(x2-2xy+y2)   4xy(x-y)2   
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  
x2 –2xy+y2=x(x-2y)+y2  x2-16y2=(x+8y)(x-8y)
  
x2+xy+y2=(x+y)2   x4y4-1=(x2y2+1)(xy+1)(xy-1)  
D(XY)=D(X)D(Y)  D(X+Y)=D(X)+D(Y)  X和Y独立  X和Y不独立  
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  
若X→Y,WY→Z,则XW→Z  若X→Y,Y→Z,则XY→Z  若XY→Z,则X→Z,Y→Z  若X→Y,则Y→Z,则X→Z  
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)]  
2x2-xy-x=2x(x-y-1)   -xy2+2xy-3y=-y(xy-2x-3)   x(x-y)-y(x-y)=(x-y)2   x2-x-3=x(x-1)-3  
-x2-y2 = -(x+y)(x-y)  x2y+2xy+4y = y(x+2)2   -49x2+x2y2 = (xy+7x)(xy-7x)  16x2+4y2-16xy = 4(2x-y)2  

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