Tính: 1/2.7 +1/2.3.7 + 1/2.3.17 + 1/2.11.17

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1. 1/2.7 +1/2.3.7 + 1/2.3.17 + 1/2.11.17

   =1/2.7+ 1/2 . 21+1/2 . 51+ 1/2. 187

   =1/2.(7+21+51+187)

   =1/2. 266

   =133

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