Một câu giải hay của tác Giả Võ Lạc trong đề thi sở Hà Tĩnh https://sieugioi.com/docs/threads/de-thi-thu-tot-nghiep-thpt-2026-mon-vat-li-so-ha-tinh-lan-2.818/

On comparing the ratios a₁/a₂, b₁/b₂ and c₁/c₂, find out whether the lines representing the following pairs of linear equations intersect at a point, are parallel or coincident: (i) 5x − 4y + 8 = 0 7x + 6y − 9 = 0 (ii) 9x + 3y + 12 = 0 18x + 6y + 24 = 0 (iii) 6x − 3y + 10 = 0 2x − y + 9 =

Phases of Moon A clear revision sheet explaining new moon, waxing crescent, first quarter, full moon, waning phases, and how the Moon reflects sunlight. #MoonPhases #LunarCycle #AstronomyLearning #ScienceNotes #eduplexacademy