Tính nhanh 500 × 4 × 2 × 25 – 500 × 3 × 2 × 30
Giải thích
500 × 4 × 2 × 25 – 500 × 3 × 2 × 30
= 500 × (4 × 2 × 25) – 500 × (3 × 2 × 30)
= 500 × 200 – 500 × 180
= 500 × (200 – 180)
= 500 × 20
= 10 000
500 × 4 × 2 × 25 – 500 × 3 × 2 × 30
= 500 × (4 × 2 × 25) – 500 × (3 × 2 × 30)
= 500 × 200 – 500 × 180
= 500 × (200 – 180)
= 500 × 20
= 10 000