Question

[☆MĭηɦღAηɦ❄]

Tìm x .

x + 4/5.9 + 4/9.13 + 4/13.17 + ... + 4/41.45  = -37/45

Answer 1

[cartoon Chung]

x+1/5-1/45 = -37/45

x+8/45        = -37/45

x               = -37/45-8/45

x                = -1