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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
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
x>0,y>0 x>0,y<0 x<0,y>0 x<0,y<0
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
甲:xy=0 乙:x2+y2=0 甲:xy=0 乙:|x|+|y|=|x+y| 甲:xy=0 乙:x、y至少有一个为零 甲:x<1
x>0,y>0 x<0,y<0 x>0,y<0 x<0,y>0
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)
x>0,y<0,|x|>|y| x>0,y<0,|y|>|x| x<0,y>0,|x|>|y| x<0,y>0,|y|>|x|
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)]