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

Toán Lớp 7: 8x^3= -125 xin moi nguoi giup do

Toán Lớp 7: 8x^3= -125 xin moi nguoi giup do

Comments ( 2 )

  1. 8x^3=-125
    =>2^3 .x^3=(-5)^3
    =(2x)^3=(-5)^3
    =>2x=-5
    =>x=-5:2
    =>x=-5/2
    Vậy x=-5/2

  2. Gửi ak =) 
    8x^3 = – 125
    => ( 2x )^3 = ( – 5 )^3
    => 2x = -5
    =>  x = ( – 5 ) : 2  
    => x = $\frac{-5}{2}$ 
    Vậy x = $\frac{-5}{2}$ 
     

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