Bạn tham khảo nhé
B=($\frac{\sqrt{x}-2}{x-1}$- $\frac{\sqrt{x}+2}{(\sqrt{x}+1)^2}$).$\frac{(1-x)^2}{2}$
B=($\frac{(\sqrt{x}-2)(\sqrt{x}-1)-(\sqrt{x}+2)(\sqrt{x}+1)}{(\sqrt{x}+1)^2(\sqrt{x}-1)}$).$\frac{(1-x)^2}{2}$
B=$\frac{x-\sqrt{x}+2-x-\sqrt{x}-2}{(\sqrt{x}+1)(\sqrt{x}-1)^2}$
B=($\frac{(-2\sqrt{x})}{(\sqrt{x}-1)^2(\sqrt{x}+1)}$) .$\frac{(1-x)^2}{2}$
B=($\frac{(-2\sqrt{x})}{(\sqrt{x}-1)^2(\sqrt{x}+1)}$). $\frac{(\sqrt{x}-1)^2(\sqrt{x}+1)^2}{2}$
B=$-\sqrt{x}$( $\sqrt{x}$-1)
