1. (x-1)³-16(x-1)
2. -16a²b^4+8ab³c²-b²c^4
3. 4x²+(-a²-6a-a)
4. (a²-6a)²-18(6a-a²)+81
1. (x-1)³-16(x-1)
2. -16a²b^4+8ab³c²-b²c^4
3. 4x²+(-a²-6a-a)
4. (a²-6a)²-18(6a-a²)+81
1、(x-1)³-16(x-1)
=(x-1)[(x-1)²-16]
=(x-1)(x-1+4)(x-1-4)
=(x-1)(x+3)(x-5)
2、-16a²b^4+8ab³c²-b²c^4
=-(16a²b^4-8ab³c²+b²c^4)
=-[(4ab²)²-2×4ab²×bc²+(bc²)²]
=-(4ab²-bc²)²
=-b²(4ab-c²)²
3、4x²+(-a²-6a-a),有问题,最后一个a是9吧?
4、(a²-6a)²-18(6a-a²)+81
= (a²-6a)²+2×9×(a²-6a)+9²
=(a²-6a+9)²
=[(a-3)²]²
=(a-3)^4
1. (x-1)³-16(x-1)
=(x-1)[(x-1)^2-16]
=(x-1)(x-1-4)(x-1+4)
=(x-1)(x-5)(x+3)
2. -16a²b^4+8ab³c²-b²c^4
=b^2(-16a^2b^2+8abc^2-c^4)
??
3. 4x²+(-a²-6a-a)
=4x^2-a^2-7a ??
4. (a²-6a)²-18(6a-a²)+81
=(a^2-6a-9)^2
=(a-3)^4