1000 : 1000 × 1000 : 1000 × 1000 - ( 1000 : 1000 ) × 2 × 3 =
1000 : 1000 × 1000 : 1000 × 1000 - 1 × 2 × 3 =
1 × 1000 : 1000 × 1000 - 1 × 2 × 3 =
1000 : 1000 × 1000 - 1 × 2 × 3 =
1 × 1000 - 1 × 2 × 3 =
1000 - 1 × 2 × 3 =
1000 - 2 × 3 =
1000 - 6 =
= 994