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-x2+2xy-y2 x4-2x3y+x2y2 (x2-3)2-2(3-x2)+1 x2-xy+12y2
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
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
12abc-9a2b2=3abc(4-3ab) 3x2y-3xy+6y=3y(x2-x+2y) -a2+ab-ac=-a(a-b+c) x2y+5xy-y=y(x2+5x)
12abc-9a2b2c=3abc(4-3ab) 3x2y-3xy+6y=3y(x2-x+2y) -a2+ab-ac=-a(a-b+c) x2y+5xy+y=y(x2+5x+1)
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
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
12abc-9a2b2=3abc(4-3ab) 3x2y-3xy+6y=3y(x2-x+2y) -a2+ab-ac=-a(a-b+c) x2y+5xy-y=y(x2+5x)