✨ คำตอบที่ดีที่สุด ✨
第14題答案錯了哦! Because: 1.答案不可能是整數 ; 2.答案只會比1299小一點(因為1299/1300大約=1)
答案如下↓
1299 × (1299/1300)
=(1300-1) × (1299/1300)
=1300 × (1299/1300) - 1 × (1299/1300)
=1299 - (1299/1300)
=1298又(1/1300)
15題:
(1996 × 2002) - (1994 × 2003)
=(1996 × 2002) - [1994 × (202 + 1)]
=1996 × 2002 - (1994 × 2002 + 1994 × 1)
=1996 × 2002 - 1994 × 2002 - 1994 × 1
=(1996 - 1994) × 2002 - 1994 × 1
=2 × 2002 - 1994
=4004 - 1994
=2010
