(1)-2分之1a²+2b²
=-2分之1(a²-4b²)
=-2分之1(a+2b)(a-2b)
(2)a的3次方b-ab的3次方
=ab(a²-b²)
=ab(a+b)(a-b)
(3)a-1+b²(1-a)
=(a-1)-b²(a-1)
=(a-1)(1-b²)
=(a-1)(1+b)(1-b)
(4)x的5次方-x
=x(x^4-1)
=x(x^2+1)(x^2-1)
=x(x^2+1)(x+1)(x-1)
(1)-2分之1a²+2b²
=-2分之1(a²-4b²)
=-2分之1(a+2b)(a-2b)
(2)a的3次方b-ab的3次方
=ab(a²-b²)
=ab(a+b)(a-b)
(3)a-1+b²(1-a)
=(a-1)-b²(a-1)
=(a-1)(1-b²)
=(a-1)(1+b)(1-b)
(4)x的5次方-x
=x(x^4-1)
=x(x^2+1)(x^2-1)
=x(x^2+1)(x+1)(x-1)