(1/1.2.3 + 1/2.3.4 + ... + 1/8.9.10).x = 23/45
(2/1.2.3 + 2/2.3.4 + ... + 2/8.9.10).x = 2.23/45
(1/1.2 - 1/2.3 + 1/2.3 - 1/3.4 + ... + 1/8.9 - 1/9.10).x = 46/45
(1/1.2 - 1/9.10).x = 46/45
(1/2 - 1/90).x = 46/45
(45/90 - 1/90).x = 46/45
22/45.x = 46/45
x = 46/45 : 22/45
x = 46/45 . 45/22
x = 23/11
=2.(1/1-1/2-1/3+1/2-1/3-1/4+...+1/8-1/9-1/10).x=2.23/45
=(1/1-1/10).x=46/45
=9/10.x=46/45
=x=46/45:9/10
=x=92/81:2=46/81.
k cho mình nha!!!"
[1/3 . (1/1.2 - 1/2.3) + 1/3 . (1/2.3 - 1/3.4) +....+ 1/3 . (1/8.9 - 1/9.10)] . x = 23/45
[ 1/3. ( 1/1.2 - 1/2.3 + 1/2.3 - 1/3.4 + ...+1/8.9 - 1/9.10)].x = 23/45
[1/3 . (1/1.2 - 1/9.10 )].x = 23/45
( 1/3 . 22/45).x = 23/45
22/135 . x =23/45
x= 23/45 : 22/135
x= 23/45. 135/22
x=69/22
mong cac ban ung ho minh nha
