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trinhgiang31102002
2 năm trước
$\frac{1}{x+2}$+$\frac{1}{(x+2)(4x+7)}$= $\frac{2x²-x}{x-1}$+$\frac{x+1}{1-x}$+ $\frac{2-x²}{x-1}$= $\frac{3x+5}{x²-5x}$+ $\frac{25-x}{25-5x}$= $\frac{5}{2x²y}$+$\frac{3}{5xy²}$+$\frac{x}{y³}$=
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