Bai 1: Cho A=\(\dfrac{a^2+2a+1}{a-1}\):(\(\dfrac{a+1}{a}\)-\(\dfrac{1}{1-a}\)+\(\dfrac{2-a^2}{a^2-a}\))
a,Rut gon
b,Tinh A biet |4a-7| =1
c,Tim a de A>0
d,Tim GTNN cua A
e, So sanh A voi\(\dfrac{-1}{2}\)
Bai 2:P=(\(\dfrac{x-1}{x+1}\)-\(\dfrac{x}{x-1}\)-\(\dfrac{3x+1}{1-x^2}\)):\(\dfrac{2x+1}{x^2-1}\)
a,Rut gon
b,Tim x de P=\(\dfrac{3}{x-1}\)
c,Tim gia tri nguyen cua x de P nhan gia tri nguyen