先化简,再求值:
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先化简,再求值:
先化简,再求值:
先化简,再求值:
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
化简值是A方 代进去三
(a+1)(a-1)*a^2(a-1)/(a-1)^2*(a+1)=a^2=3
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
(a-1)(a+1)/(a-1)2÷(a+1)/a2(a-1)=(a+1)/(a-1)×a2(a-1)/(a+1)=a2 =3
原式=(a+1)(a-1)/(a-1)^2*[a^2(a-1)/(a+1)]
=a^2
=(根号3)^2
=3