Question

[Nguyen Trung Nguyen]

Tìm x biết :1/2+1/6+1/12+1/20+1/30+1/x=41/42

Answer 1

[Nguyễn Ngọc Tuấn]

1/2 + 1/6 + 1/12 + 1/20 + 1/30 1/x = 41/42

5/6 + 1/x = 41/42

1/x = 41/42 - 5/6 

1/x = 1/7 

vậy x = 7

Answer 2

[soong jong ki]

x = 7 ở vong 18 đúng không