3X/2×5 + 3X/5×8 + 3X/8×11 + 3X/11×14 =1/21 nhanh lên bạn nhé

0 bình luận về “3X/2×5 + 3X/5×8 + 3X/8×11 + 3X/11×14 =1/21 nhanh lên bạn nhé”

1. 3x/2.5 + 3x/5.8 + 3x/8.11 + 3x/11.14=1/21

   ⇒ x.(3/2.5 + 3/5.8 + 3/8.11 + 3/11.14=1/21

   ⇒ x.(1/2 – 1/5 + 1/5 – 1/8 + 1/8 – 1/11 + 1/11 – 1/14)=1/21

   ⇒ x.(1/2 – 1/14)=1/21

   ⇒ x.3/7=1/21

   ⇒x        = 1/21 : 3/7

   ⇒ x        = 1/9

   HỌC TỐT NHÉ!!!

    

   Trả lời

2. `(3x)/2.5 + (3x)/5.8 + (3x)/8.11 + (3x)/11.14 = 1/21`

   `⇒ x . (3/2.5 + 3/5.8 + 3/8.11 + 3/11.14) = 1/21`

   `⇒ x . (1/2 – 1/5 + 1/5 – 1/8 + 1/8 – 1/11 + 1/11 – 1/14) = 1/21`

   `⇒ x . (1/2 – 1/14) = 1/21`

   `⇒ x . (7/14 – 1/14) = 1/21`

   `⇒ x . 3/7 = 1/21`

   `⇒ x = 1/21 : 3/7`

   `⇒ x = 1/21 . 7/3`

   `⇒ x = 1/9`

   Trả lời