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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: giúp mk với ạ . tìm x biết : (x-2) ^3 / 8 = -27/64 . 3/5 + (-4/3) +( -3/5)

Toán Lớp 7: giúp mk với ạ .
tìm x biết :
(x-2) ^3 / 8 = -27/64 . 3/5 + (-4/3) +( -3/5)

Comments ( 1 )

  1. ((x-2)^3)/(8)=(-27)/(64)*3/5+((-4)/(3))+((-3)/(5))
    => ((x-2)^3)/(8)=(-81)/(320)+((-4)/(3))+((-3)/(5))
    => ((x-2)^3)/(8)=(-81)/(320)+(-7)/(5)
    => ((x-2)^3)/(8)=(-529)/(320)
    => (x-2)^3=(-529)/(320)*8
    => (x-2)^3=(-529)/(40)
    => x-2=$\frac{\sqrt[3]{13225}}{10}$
    => x=$\frac{\sqrt[3]{13225}}{10}$ +2

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222-9+11+12:2*14+14 = ? ( )