Tính: 1/2.7 +1/2.3.7 + 1/2.3.17 + 1/2.11.17 13/10/2021 Bởi Ariana Tính: 1/2.7 +1/2.3.7 + 1/2.3.17 + 1/2.11.17
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 Bình luận
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