Question

数学计算题，因式分解？谢谢

2(x＋y)²(x－y)－4(x＋y)³
25x²(a－b)－b＋a
6y²＋19y＋15
最好用纸写出来，追加悬赏哦谢谢

Answer 1

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)

Answer 2

1、=2(x+y)^2[x-y-2(x+y)]=-2(x+y)^2(x+3y)
2、=25x^2(a-b)-(a-b)=(25x^2-1)(a-b)=(5x+1)(5x-1)(a-b)
3、=(3y+5)(2y+3)

Answer 3

2(x＋y)²(x－y)－4(x＋y)³=2(x＋y)²[（x-y）-2(x+y)]=2(x＋y)²(-x-3y);
25x²(a－b)－b＋a=(25x²－1)(a-b)=(5x+1)(5x-1)(a-b);

6y²＋19y＋15=(2y+3)(3y+5)

Answer 4

Answer 5

Answer 6