Question

不能只有答案或笼统概括（x²-y²-2x+1）÷（x+y-1）=（x四次方-2x²+1）÷

Answer 1

(x²-y²-2x+1)÷(x+y-1)

=[(x-1)²-y²]÷(x+y-1)

=(x+y-1)(x-y-1)÷(x+y-1)

=x-y-1

(x^4-2x²+1）÷(x²+2x+1)

=(x²-1)²÷(x+1)²

=(x+1)²(x-1)²÷(x+1)²

=(x-1)²

(a^4-16)÷（a-2)

=(a²+4)(a²-4）÷（a-2)

=(a²+4)(a+2)(a-2)÷（a-2)

=(a²+4)(a+2)