2(x+y)²(x-y)-4(x+y)³25x²(a-b)-b+a6y²+19y+15
问题描述:
2(x+y)²(x-y)-4(x+y)³
25x²(a-b)-b+a
6y²+19y+15
答
2(x+y)²(x-y)-4(x+y)³=2(x+y)²(x-y-2x-2y)=2(x+y)²(-x-3y)=-2(x+y)²(x+3y)
25x²(a-b)-b+a=25x²(a-b)-(a-b)=(a-b)(25x²-1)=(a-b)(5x+1)(5x-1)
6y²+19y+15=(2x+3)(3x+5)