2(x+y)²(x-y)-4(x+y)³25x²(a-b)-b+a6y²+19y+15
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![2(x+y)²(x-y)-4(x+y)³25x²(a-b)-b+a6y²+19y+15](/uploads/image/z/225754-34-4.jpg?t=2%28x%EF%BC%8By%29%26%23178%3B%28x%EF%BC%8Dy%29%EF%BC%8D4%28x%EF%BC%8By%29%26%23179%3B25x%26%23178%3B%28a%EF%BC%8Db%29%EF%BC%8Db%EF%BC%8Ba6y%26%23178%3B%EF%BC%8B19y%EF%BC%8B15)
2(x+y)²(x-y)-4(x+y)³25x²(a-b)-b+a6y²+19y+15
2(x+y)²(x-y)-4(x+y)³
25x²(a-b)-b+a
6y²+19y+15
2(x+y)²(x-y)-4(x+y)³25x²(a-b)-b+a6y²+19y+15
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)