[tex]( \frac{5}{2} - 1) {}^{ - 1} + ( \frac{3}{4} - \frac{5}{4}) {}^{ - 2} = \\ \\ ( \frac{3}{2} ) {}^{ - 1} + ( - \frac{1}{2} ) {}^{2} \\ \\ \frac{2}{3} + ( - 2) {}^{2} \\ \\ \frac{2}{3} + 4 \\ \\ \frac{2 + 12}{3} = \frac{14}{3} [/tex]
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[tex]( \frac{5}{2} - 1) {}^{ - 1} + ( \frac{3}{4} - \frac{5}{4}) {}^{ - 2} = \\ \\ ( \frac{3}{2} ) {}^{ - 1} + ( - \frac{1}{2} ) {}^{2} \\ \\ \frac{2}{3} + ( - 2) {}^{2} \\ \\ \frac{2}{3} + 4 \\ \\ \frac{2 + 12}{3} = \frac{14}{3} [/tex]