X=0.0111，Y=-0.0100，则[X+Y]反=( )

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<2xyx<2xy<

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

3x²y-4xy²； x²y-4xy²； x²y+2xy²； -x²y-2xy²

xy(2x－2y)² 2xy(x－y)² 4xy(x²－2xy+y²) 4xy(x－y)²

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

e^xy[xsin(x+y)-cos(x+y)] e^xy[xsin(x+y)+cos(x+y)] e^xy[xsinxy+cos(x+y)] e^xy[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）

e^xy[xsin(x+y)-cos(x+y)] e^xy[xsin(x+y)+cos(x+y)] e^xy[xsinxy+cos(x+y)] e^xy[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

e^xy[xsin(x+y)-cos(x+y)] e^xy[xsin(x+y)+cos(x+y)] e^xy[xsinxy+cos(x+y)] e^xy[ysin(x+y)+xcos(x+y)]

8x²y-24xy²=8xy（x-3y）; ax+bx+ay+by=x（a+b）+y（a+b） 12x²y+14x²y²-2xy=2xy（6x+7xy-1）; x³-8=（x-2）（x²+2x+4）

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