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1. \(452+452+452+452=452 \ \cdot\) [ ] \(=\) [ ].
2. \(555+555+555+555+555+555+555+555+555=555 \ \cdot\) [ ] \(=\) [ ].
3. \(23+23+23+23+23+32+32+32=23\ \cdot\) [ ] \(+ 32 \ \cdot\) [ ] \(=\) [ ] \(+\) [ ] \(=\) [ ].