把下列各式因式分解
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-28y^4-21y³+7y²
=-7y²(4y²+3y-1)
=-7y²(4y-1)(y+1)
-8/3a²b^(n+1)-4/3ab^(n+1)-2/3ab^n
=-2/3ab^n (4ab+2b+1)
6a(b-a)²-2(a-b)³
=6a(a-b)²-2(a-b)³
=2(a-b)²(3a-a+b)
=2(a-b)²(2a+b)
x(b+c-d)-y(d-b-c)-2c+2d-2b
=x(b+c-d)+y(b+c-d)-(b+c-d)
=(b+c-d)(x+y-2)
=-7y²(4y²+3y-1)
=-7y²(4y-1)(y+1)
-8/3a²b^(n+1)-4/3ab^(n+1)-2/3ab^n
=-2/3ab^n (4ab+2b+1)
6a(b-a)²-2(a-b)³
=6a(a-b)²-2(a-b)³
=2(a-b)²(3a-a+b)
=2(a-b)²(2a+b)
x(b+c-d)-y(d-b-c)-2c+2d-2b
=x(b+c-d)+y(b+c-d)-(b+c-d)
=(b+c-d)(x+y-2)
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