Tính nhanh: 2582 \(\large\times\) 6 + 26 173 \(\large\times\) 2 – 2582

Tính nhanh:

2582 \(\large\times\) 6 + 26 173 \(\large\times\) 2 – 2582 \(\large\times\) 6 – 15 173 \(\large\times\) 2

• A. 12 000
• B. 21 000
• C. 22 000
• D. 14 000

 2582 \(\large\times\) 6 + 26 173 \(\large\times\) 2 – 2582 \(\large\times\) 6 – 15 173 \(\large\times\) 2
= (2582 \(\large\times\) 6 – 2582 \(\large\times\) 6) + (26 173 \(\large\times\) 2 – 15 173 \(\large\times\) 2)
= 0 + (26 173 – 15 173) \(\large\times\) 2
= 11 000 \(\large\times\) 2
= 22 000