先化简,再求值:(1-【1⼀(a-1)】)÷【(a눀-4a+4)⼀(a눀)】,其中a=-1

2024-12-20 14:07:55
推荐回答(1个)
回答1:

=(a-1-1)/(a-1)÷(a-2)^2/a^2
=(a-2)/(a-1)÷(a-2)^2/a^2
=a^2/(a-1)*(a-2)
=1/(-2)*(-3)
=1/6