展开 (0.5-1/z)/(z^3-1.3z^2+0.4z)*z/z

解答

展开

\frac{0.5 - \frac{1}{z}}{z ^{3} - 1.3 z ^{2} + 0.4 z} \cdot \frac{z}{z}

\frac{0.5 - \frac{1}{z}}{z ^{3} - 1.3 z ^{2} + 0.4 z}

求解步骤

\frac{0.5 - \frac{1}{z}}{z ^{3} - 1.3 z ^{2} + 0.4 z} \cdot \frac{z}{z}

使用法则

\frac{a}{a} = 1

\frac{z}{z} = 1

= 1 \cdot \frac{- \frac{1}{z} + 0.5}{z ^{3} - 1.3 z ^{2} + 0.4 z}

乘以:

\frac{0.5 - \frac{1}{z}}{z ^{3} - 1.3 z ^{2} + 0.4 z} \cdot 1 = \frac{0.5 - \frac{1}{z}}{z ^{3} - 1.3 z ^{2} + 0.4 z}

= \frac{0.5 - \frac{1}{z}}{z ^{3} - 1.3 z ^{2} + 0.4 z}

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