`1) `
`8 × 24 × 6 + 12 × 4 × 52 + 2 × 22 × 24`
`= 48 × 24 + 48 × 52 + 48 × 22`
`= 48 x (24 + 52 + 22)`
`= 48 × 98 `
`= 4704`
`2)
`18 × 58 × 2 - 9 × 27 × 4 - 12 × 69 × 3 `
`= 36 × 58 - 36 × 27 - 36 × 69`
`= 36 × (58 - 27 - 69)`
`= 36 × (-38)`
`= -1368`
`3)`
`30 × 85 × 3 + 18 × 72 × 5 - 45 × 37 × 2 - 9 × 20 × 10`
`= 90 × 85 + 90 × 72 - 90 × 37 - 90 × 20`
`= 90 × (85 + 72 - 37 - 20)`
`= 90 × 100`
`= 9000`