Ui bài khó quá mk ko làm đc xl 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X:0,1+X:0,25+X:0,5+X×4
⇒ x :0,1+ x :0,25+ X:0,5+x:0,25=2018
⇒ X:(0,1+0,25+0,5+0,25)=2018
⇒ X:1,1=2018
⇒ x=2018 x1,1=2219,8
Vậy X=2219,8
\(x:0,1+x:0,25+x:0,5+x\cdot4=2018\)
\(x\cdot10+x\cdot4+x\cdot2+x\cdot4=2018\)
\(x\left(10+4+2+4\right)=2018\)
\(x\cdot20=2018\)
\(\Leftrightarrow x=100,9\)
P/s: Ko kho dau a :>
\(x\div0,1+x\div0,25+x\div0,5+x\cdot4=2018\)
\(\Rightarrow x\cdot10+x\cdot4+x\cdot2+x\cdot4=2018\)
\(\Rightarrow x(10+4+2+4)=2018\)
\(\Rightarrow x\cdot20=2018\)
\(\Rightarrow x=2018\div20=100,9\)
X:0,1+X:0,25+X:0,5+Xx4=2018
=> Xx10+Xx4+Xx2+Xx4=2018
Xx(10+4+2+4)=2018
X x 20=2018
X=2018:20
X=100,9
Vậy X=100,9
