tính nhanh 1995 x 1996-1000 ____________________________ 1995 x 1995+995

0 bình luận về “tính nhanh 1995 x 1996-1000 ____________________________ 1995 x 1995+995”

1. Hướng dẫn trả lời:

   $\text{$\dfrac{1995 × 1996 – 1000}{1995 × 1995 + 995}$.}$

   $\text{= $\dfrac{1995 × (1995 + 1) – 1000}{1995 × 1995 + 995}$.}$

   $\text{= $\dfrac{1995 × 1995 + 1995 – 1000}{1995 × 1995 + 995}$.}$

   $\text{= $\dfrac{1995 × 1995 + 995}{1995 × 1995 + 995}$.}$

   $\text{= 1.}$

   Đáp án:

   $\text{= 1.}$

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2. `(1995 × 1996 – 1000)/(1995 × 1995 + 995)`

   `= (1995 × 1995 + 1995 – 1000)/(1995 × 1995 + 995)`

   `= (1995 × 1995 + (1995 – 1000))/(1995 × 1995 + 995)`

   `= (1995 × 1995 + 995)/(1995 × 1995 + 995)`

   `= 1`

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