`1367 × 139 × (18^2 - 15^2) - 1268 × 13^8 × 13^4 ÷ 13^10`
`=1367 × 139 × (324 - 225) - 1268 × 13^8 × 13^4 ÷ 13^10`
`=1367 × 139 × (324 - 225) - 1268 × 13^12 ÷ 13^10`
`=1367 × 139 × (324 - 225) - 1268 × 13^2`
`= 1367 × 139 ×99 - 1268 × 13^2`
`= 1367 × 139 × 99 - 1268 × 13^2`
` = 18811287 - 1268 × 169`
` =18811287 -214292`
` = 18596995`