\(x\div0,25-x\times0,5=4,2\)
\(\Leftrightarrow x\times4-x\times0,5=4,2\)
\(\Leftrightarrow x\times\left(4-0,5\right)=4,2\)
\(\Leftrightarrow x\times3,5=4,2\)
\(\Leftrightarrow x=1,2\)
Vậy \(x=1,2\)
x : 0,25 - x . 0,25 = 4,2 ( . là dấu nhân )
\(x\ .\ ( 4 - \ {1\over 4}) = 4,2\)
\(x \ . \ 3,75 = 4,2\)
\(x = 1,12\)