Сравни значения выражений

1. \(15^5\) [ \(\lt\) | \(\gt\) | \(=\) ] \(1\) .
2. \(1,7^4\) [ \(\lt\) | \(\gt\) | \(=\) ] \(1\) .
3. \(0,7^{-4}\) [ \(\lt\) | \(\gt\) | \(=\) ] \(1\) .
4. \(1,5^{-6}\) [ \(\lt\) | \(\gt\) | \(=\) ] \(1\) .