Tính nhanh : A, 328/435 x 468/432 x 435/164 x 432/984 x 164/468 B, 2000/2001 x 2002/2003 x 2001/2002 x 2003/2004 x 2006/2000

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1. `a_)`

   `328/435 xx 468/432 xx 435/164 xx 432/984 xx 164/468`

   `= (328/435 xx 435/164) xx (468/432 xx 164/468) xx 432/984`

   `= 328/164 xx 164/432 xx 432/984`

   `= (328 xx 164 xx 432)/(164 xx 432 xx 984)`

   `= 328/984`

   `= 1/3`

   `b_)`

   `2000/2001 xx 2002/2003 xx 2001/2002 xx 2003/2004 xx 2006/2000`

   `= (2000/2001 xx 2006/2000) xx (2002/2003 xx 2001/2002) xx 2003/2004`

   `= 2006/2001 xx 2001/2003 xx 2003/2004`

   `= (2006 xx 2001 xx 2003)/(2001 xx 2003 xx 2004)`

   `= 2006/2004`

   `= 1003/1002`

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2. `a ) 328/435 × 468/432 × 435/164 × 432/984 × 164/468`

   `= {328 × 468 × 435 × 432 × 164}/{435 × 432 × 164 × 984 × 468}`

   `= 328/984`

   `= 1/3`

   `b ) 2000/2001 × 2002/2003 × 2001/2002 × 2003/2004 × 2006/2000`

   `= {2000 × 2002 × 2001 × 2003 × 2006}/{2001 × 2003 × 2002 × 2004 × 2000}`

   `= 2006/2004`

   `= 1003/1002`

   `#dtkc`

    

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