2,25 - (x - 0,9) = 0,57
=> x - 0,9 = 1,68
=> x = 2,58
vậy_
2,25-(x-0,9)=0,57
225/100-(x-9/10)=57/100
x-9/10=225/100-57/100
x-9/10=168/100=42/25
x =42/25+9/10
x =129/50
\(2,25-\left(x-0,9\right)=0,57\)
\(x-0,9=1,68\)
\(x=2,58\)
2.25-(x-0.9)=0.57
x-0.9=2.25-0.57
x-0.9=1.68
x=1.68+0.9
x=2.58
Vay x=2.58