chx hc đến

2x + 3x +5 x + 900 = 11.20 + 4

<=> 10x + 900 = 224

<=> 10x = 224 - 900 = -676

<=> x = -338/5 = -67,6

= 3x² - 3x - 3x² + 27 = 27 - 3x = 3(9 - x)

?

a.    Trong  _____nóng________  ngoài _____lạnh____

b.____chia____ ngọt____________ bùi

 c. 

Mưa____to___ gió ___lớn______ ;

 d. Lên ___voi____ xuống___chó____

8765431

\(\Leftrightarrow\dfrac{4}{5}x-\dfrac{1}{3}x+\dfrac{2}{5}+1=\dfrac{1}{3}\\ \Leftrightarrow\dfrac{7}{15}x=-\dfrac{16}{15}\\ \Leftrightarrow x=-\dfrac{16}{7}\)

<=> 10x + 900 = 224

<=> 10x = -676

<=> x = -338/5 = -67,6