Giúp mình với Tính nhanh: 4, 3x25x8+4x37x6+2x38x12 5, 1050:15-450:15 6, 1968:16+5136:16-704:16

`4)3×25×8+4×37×6+2×38×12`

`=(3×8)×25+(4×6)×37+2×12×38`

`=24×25+24×37+24×38`

`=24×(25+37+38)`

`=24×100`

`=2400`

`5)1050:15-450:15`

`=(1050-450):15`

`=600:15`

`=40`

`6)1968:16+5136:16-704:16`

`=(1968+5136-704):16`

`=6400:16`

`=400`