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8x2﹣8y2 8y2﹣8x2 8(x+y)2 8(x﹣y)2
3a(a-b)-5b(a-b)=(a-b)(3a-5b) 4x2-y2=(2x-y)(2x+y) -4x2+12xy-9y2=-(2x-3y)2 x4-8x2y2+16y4=(x2-4y2)2
8x+4=12x 4y﹣4=y 4y﹣3y=y 3x﹣x=3
, ,则过A.B.及原点O.三点的圆的方程是( ) A.x2+y2+4x﹣3y=0B.x2+y2﹣4x﹣3y=0 x2+y2+4x﹣3y﹣4=0 x2+y2﹣4x﹣3y+8=0
x4+x4=2x8 x3•x2=x6 (x2y)3=x6y3 (x﹣y)(y﹣x)=x2﹣y2
x4+x4=2x8 (x2y)3=x6y (x2)3=x5 -x3·(-x)5=x8
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)
4x2y2 -4x2y2 -12x3y3 12x3y3