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