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2x2﹣xy= 2x(x﹣y) ﹣xy2+2xy﹣y=﹣y(xy﹣2x) 2x2﹣8x+8=2(x﹣2)2 x2﹣x﹣3= x(x﹣1)﹣3 第1题
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
3x2y2﹣2xy﹣x2+8y﹣3x﹣1 3x2y2﹣2xy﹣x2+8y﹣3x+1 3x2y2﹣2xy﹣x2+8y+x+1 3x2y2﹣2xy﹣x2+8y+x﹣1
12xy-4x 12xy-10x 12xy-8x 12xy-2x
3a2+a2=3a4 8xy﹣7xy=xy 3x2y﹣xy2=2x2y 3a+b=3ab
3x+3y=6xy ﹣y2﹣y2=0 3(x+8)=3x+8 ﹣(6x+2y)=﹣6x﹣2y
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)
3x+3y= 6 xy -y2-y2=0 3(x+8)=3x +8 - (6 x +2 y)=-6 x-2 y
4x2y2 -4x2y2 -12x3y3 12x3y3