9x + 22 . 5 = 102
9x + 4 . 5 = 100
9x + 20 = 100
9x = 100 - 20
9x = 80
x = 80 : 9
x = 80/9
Chúc bạn học tốt!! ^^
Ta có: \(9x+2^2\cdot5=10^2\)
\(\Leftrightarrow9x=100-20=80\)
hay \(x=\dfrac{80}{9}\)
9x + 22 . 5 = 102
9x + 4 . 5 = 100
9x + 20 = 100
9x = 100 - 20
9x = 80
x = 80 : 9
x = 80/9