cho bt: P=\(\dfrac{x^2+x}{x^2-2x+1}\):(\(\dfrac{x+1}{x}\)-\(\dfrac{1}{1-x}\)+\(\dfrac{2-x^2}{x^2-x}\))

a,tìm đkxđ rồi rút gọn 

b,tính P biết |1+2x|=3

c,tìm x để P=\(\dfrac{-1}{2}\)

d,tìm x để P<1