(2x+y-3)(2x-y+3)

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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

3x²y与3xy² 3xy与﹣2xy² ﹣2xy²与﹣2ab² 0与π

1 2 3 4

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

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

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

12xy-4x 12xy-10x 12xy-8x 12xy-2x

3m﹣m=2 a²b﹣ab²=0 xy﹣2xy=﹣xy 2x+2y=5xy

3m﹣m=2 a²b﹣ab²=0 2x+3y=5xy xy﹣2xy=﹣xy

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

2x+2y=2xy （x²y³）²=x⁴y⁵ （xy）²÷

=（xy）³ 2xy﹣3yx=xy

3a²+a²=3a⁴ 8xy﹣7xy=xy 　 3x²y﹣xy²=2x²y 3a+b=3ab

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

－2xy² 2xy －2xy 2x²y