Question

Tim x

x+15,7=7,2x2,5

x x9,1+x x1,9=26,4

x : 12,5=48-45,66

x x9,9+x:10=12,5

Answer 1

    \(x+15,7=7,2\times2,5\)
    \(x+15,7=18\) 
    \(x=18-15,7\)   
    \(x=2,3\)
    Vậy \(x=2,3\)


    \(x\times9,1+x\times1,9=26,4\)
⇔\(x\times\left(9,1+1,9\right)=26,4\)
    \(x\times10=26,4\)
    \(x=26,4:10\)
    \(x=2,64\)
    Vậy \(x=2,64\)


    \(x:12,5=48-45,66\)
    \(x:12,5=2,34\)
    \(x=2,34\times12,5\)
    \(x=29,25\)
    Vậy \(x=29,25\)


    Sửa đề:
    \(x\times9,9+x\times10=12,5\)
⇔\(x\times\left(9,9+10\right)=12,5\)
    \(x\times19,9=12,5\)
    \(x=12,5:19,9\)
    \(x=\dfrac{125}{199}\)
    Vậy \(x=\dfrac{125}{199}\)
\(#PeaGea\)

Answer 2

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