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thuhuongdang153
2 năm trước
Với giá trị nào của x thì mỗi căn thức sau có nghĩa `a)` $\dfrac{1}{\sqrt{x+2\sqrt{x-1}}}$ `b)` $\sqrt{x^2-5x+6}$ `c)` $\sqrt{4-|x|}$
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