Question

急急急！！各位数学天才帮忙解一个题过程答案都要 先化解再求值计算(1-1/a+1)÷a2-a/a÷1，其中a=1/2 a...

急急急！！各位数学天才帮忙解一个题过程答案都要
先化解再求值计算(1-1/a+1)÷a2-a/a÷1，其中a=1/2
a2的2是指平方
急急急！快噢！谢谢

Answer 1

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

Answer 2

[1-1/(a+1)]÷(a²-a)/a÷1
=a/(a+1)÷(a-1)
=a/[(a+1)(a-1)]
=a/(a²-1)
=1/[4x(1/4-1)]
=1/(-3)
=-1/3

Answer 3

(1-1/a+1)÷a2-a/a÷1，其中a=1/2
=a/(a+1)*a/a(a-1)
=a^2/(a^2-1)
=1/4/-3/4
=-1/3

Answer 4

(1-1/a+1)÷a2-a/a÷1
=（2-1/a)÷a2-1÷1
=(2a-1)/a÷a2-1
=(2a-1)/a3-1
=(-a3+2a-1)/a3
=2/a2-1/a3-1=2/(0.5*0.5)-1/(0.5*0.5*0.5)-1=8-8-1=-1