(a²-1)÷(a-1)=(a+1)(a-1)÷(a-1)=a+1
(x的三次方-1)÷(x-1)
=(x-1)(x平方+x+1)÷(x-1)
= x平方+x+1
(y²-4y+4)÷(y-2)=(y-2)²÷(y-2)=y-2
(m的三次方+64)÷(m²-4m+16)
=(m+4)(m²-4m+16)÷(m²-4m+16)
=m+4
(a²-1)÷(a-1)=(a+1)(a-1)÷(a-1)=a+1
(x的三次方-1)÷(x-1)
=(x-1)(x平方+x+1)÷(x-1)
= x平方+x+1
(y²-4y+4)÷(y-2)=(y-2)²÷(y-2)=y-2
(m的三次方+64)÷(m²-4m+16)
=(m+4)(m²-4m+16)÷(m²-4m+16)
=m+4