Выбери верные ответы

Сравни выражения, если \(\boldsymbol{a\gt b}\) .

1. \(a+12,8\) [ \(=\) | \(\gt\) | \(\lt\) ] \(b+12,8\) .
2. \(a-\dfrac{1}{12}\) [ \(=\) | \(\gt\) | \(\lt\) ] \(b-\dfrac{1}{12}\) .
3. \(9,8a\) [ \(=\) | \(\gt\) | \(\lt\) ] \(9,8b \) .
4. \(-\dfrac{5}{7}a \) [ \(=\) | \(\gt\) | \(\lt\) ] \(-\dfrac{5}{7}b \) .