Đáp án:
Giải thích các bước giải:
P=$\frac{√x-(√x+1)}{√x(√x-1)}$÷$\frac{(√x+1)(√x-1)-(√x+2)(√x-2}{(√x-2)(√x-1)}$
P=$\frac{√x-√x-1}{√x(√x-1}$÷ $\frac{x-1-(x-4)}{(√x-2)(√x-1)}$
P=$\frac{-1}{√x(√x-1}$÷ $\frac{x-1-x+4}{√x-2)(√x-1)}$
P=$\frac{-1}{√x(√x-1}$÷ $\frac{3}{√x-2)(√x-1}$
P=$\frac{-1}{√x(√x-1}$ ×$\frac{√x-2)(√x-1}{3}$
P=$\frac{-√x-2}{3√x}$