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$\frac{√x^{3}}{√xy - 2y}$ - $\frac{2x}{x + √x - 2√xy -2√y}$ . $\frac{1- x}{1-√x}$ a,Rút gọn B b, Tìm tất cả các số nguyên dương x để y= 625 và B < 0,2
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