Tính nhanh : a, (0,125 x 10 – 125\10 : 10 ) x 2001 x 2002 x 2003 b, 28 + 62 x a x ( a x 1 – a : 1 ) + 28 x 8 + 28

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1. * Bạn tham khảo nha >v< *

   $a, ( 0,125 × 10 – \dfrac{125}{10} ÷ 10 ) × 2001 × 2002 × 2003$

   $= ( 1,25 – 12,5 ÷ 10 ) × 2001 × 2002 × 2003$

   $= ( 1,25 – 1,25 ) × 2001 × 2002 × 2003$

   $= 0 × 2001 × 2002 × 2003$

   $= 0$

   $b, 28 + 62 × a × ( a × 1 – a ÷ 1 ) + 28 × 8 + 28$

   $= 28 × ( 1 + 8 + 1 ) + 62 × a × ( a – a )$

   $= 28 × 10 + 62 × a × 0$

   $= 280 + 0$ 

   $= 280$  

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2. a, (0,125 x 10 – 125/10 : 10 ) x 2001 x 2002 x 2003

   = (1,25 – 12,5 ÷ 10) x 2001 x 2002 x 2003

   = (1,25 – 1,25) x 2001 x 2002 x 2003

   = 0 x 2001 x 2002 x 2003 = 0

   b, 28 + 62 x a x ( a x 1 – a : 1 ) + 28 x 8 + 28

    = 28×(1+8+1) +62 x a x ( a – a )

   = 28×10 + 62 x a x 0

   = 280 + 0= 280

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