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a) Cho $\frac{x}{2}$ = $\frac{y}{5}$ = $\frac{z}{7}$ Tình giá trí của biểu thức: A= $\frac{x-y+z}{x+2y-z}$ b) Tìm hai số biết tỉ số của chúng bằng $\frac{5}{7}$ và tổng các bình phương bằng 4736
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