(1/5)分解因式:(1)ab的四次方-a (2)(y-x)的平方+2x-2y 计算:-2-根号...
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ab的四次方－a
=a(b^4-1)
=a(b^2+1)(b^2-1)
=a(b^2+1)(b+1)(b-1)
（y－x）的平方＋2x－2y
=(x-y)^2+2(x-y)
=(x-y)(x-y+2)
