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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
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)
(x+5)(x-5)=x2-25 x2+x+1=x(x+1)+1 -2x2-2xy=-2x(x+y) 3x+6xy+9xz=3x(2y+9z)
2x+2y=2xy (x2y3)2=x4y5 (xy)2÷=(xy)3 2xy﹣3yx=xy
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