https://hoc247.net/hoi-dap/lich-su-7/ke-ten-cac-trieu-dai-phong-kien-viet-nam-ma-em-da-duoc-hoc-faq371823.html

Giống tui là tích :>>

A nha

X là : 21/6

cục tẩy , ba chục , lục bát

\(\text{720 : [41−(2x−5)] = 40720:[41−(2x−5)]=40}\)

\(\text{⇔41−(2x−5)=720:40}\)

\(\text{⇔ 41−2x+5=18}\)

\(\text{⇒ 46 −2x=18}\)

\(\text{⇔2x=28}\)

\(\text{⇔x=14}\)