Đáp án:
Giải thích các bước giải:
${\frac{1-\sqrt[]{x-1}}{\sqrt[]{x-2\sqrt[]{x-1}}} \\ =\frac{1-\sqrt[]{x-1}}{\sqrt[]{x-1-2\sqrt[]{x-1}+1}}\\ =\frac{1-\sqrt[]{x-1}}{\sqrt[]{(\sqrt[]{x-1}-1)^2}}\\ =\frac{1-\sqrt[]{x-1}}{|\sqrt[]{x-1}-1|}\\ =\frac{1-\sqrt[]{x-1}}{|\sqrt[]{x-1}-1|}\\ =\frac{1-\sqrt[]{x-1}}{\sqrt[]{x-1}-1\\ =-1\\ or\\ =\frac{1-\sqrt[]{x-1}}{1-\sqrt[]{x-1}}=1}}$
chacws vaayj :))
