Вычисли и выбери верные ответы

1. \(-\dfrac 28 + \dfrac 34 =\) [ \(-\frac 18\) | \(\frac 12\) | \(-\frac 14\) | \(\frac 38\) ].
2. \(1\dfrac {3}{5}-2\dfrac{1}{10}+ \left(-4\dfrac {7}{5}\right) =\) [ \(-5\frac {9}{10}\) | \(2\frac 15\) | \(-4\frac {1}{10}\) | \(-3\frac 15\) ].
3. \(\dfrac {14}{9} -\left(-\dfrac{7}{18}\right)+\left(-\dfrac {1}{18}\right) =\) [ \(1 \frac 89\) | \(-1\frac 89\) | \(\frac {7}{18}\) | \(1\frac {1}{9}\) ].