Question

初三数学题。先化简，再求值：

先化简，再求值：

Answer 1

很简单，a²-1/a²-2a+1=(a+1)(a-1)/(a-1)²
a+1/a3-a²=a+1/a²(a-1)
原式==(a+1)(a-1)/(a-1)² 乘以a²(a-1)/a+1=a²

把a=√3
代入
=3

Answer 2

原式=(a²-1)/(a²-2a+1)×(a^3-a²)/(a+1)
=a²(a+1)(a-1)(a-1)/[(a+1)(a-1)²]
=a²
a=√3
原式=a²=3

Answer 3

原式＝(a+1)(a-1)/(a-1)^2*[a^2(a-1)/(a+1)]
＝a^2
＝(根号3）^2
＝3

Answer 4

化简值是A方 代进去三

Answer 5

(a-1)(a+1)/(a-1)2÷(a+1)/a2(a-1)=（a+1)/(a-1)×a2(a-1)/(a+1)=a2 =3