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phuonganhvt48
2 năm trước
thu gọn các biểu thức sau a, $\frac{3}{x+3}$ + $\frac{1}{x-3}$ - $\frac{18}{9-x^2}$ b, $\frac{4x^2-3x+17}{x^3-1}$ + $\frac{2x-1}{x^2+x+1}$ + $\frac{6}{1-x}$ c, $\frac{x+2}{x+3}$ - $\frac{5}{x^2+x-6}$ + $\frac{1}{2-x}$
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