rút gọn x-1 / √y -1 . √( √y -1) ² / √(x-1)^4 01/09/2021 Bởi Quinn rút gọn x-1 / √y -1 . √( √y -1) ² / √(x-1)^4
$\dfrac{x-1}{\sqrt{y-1}}.\dfrac{\sqrt{(y-1)^{2}}}{\sqrt{(x-1)^{4}}}\\=\dfrac{x-1}{\sqrt{y-1}}.\dfrac{y-1}{(x-1)^{2}}\\=\dfrac{1}{\sqrt{y-1}}=\dfrac{y-1}{x-1}\\=\dfrac{y-1}{\sqrt{y-1}.(x-1)}$ Bình luận
$\dfrac{x-1}{\sqrt{y-1}}.\dfrac{\sqrt{(y-1)^{2}}}{\sqrt{(x-1)^{4}}}\\=\dfrac{x-1}{\sqrt{y-1}}.\dfrac{y-1}{(x-1)^{2}}\\=\dfrac{1}{\sqrt{y-1}}=\dfrac{y-1}{x-1}\\=\dfrac{y-1}{\sqrt{y-1}.(x-1)}$