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

Toán Lớp 6: tìm x (2x-1)^3 =27 (x+2)^3=(2x)^3 (2x+1)^3 =125 (x+1)^2=16

Toán Lớp 6: tìm x
(2x-1)^3 =27
(x+2)^3=(2x)^3
(2x+1)^3 =125
(x+1)^2=16

Comments ( 2 )

  1. Giải đáp:
    a) x=2
    b) x=2
    c) x=2
    d) x = 3 hoặc x = -5
    Lời giải và giải thích chi tiết:
    a) $(2x-1)^{3}$ = $3^{3}$ <=> 2x – 1 = 3 <=> 2x = 4 <=> x = 2
    b) $(x+2)^{3}$ = $(2x)^{3}$ <=> x+2=2x <=> 2=x
    c) $(2x+1)^{3}$ = $5^{3}$ <=> 2x+1=5 <=> 2x = 4 <=> x = 2
    d) $(x+1)^{2}$ = $4^{2}$ <=> \(\left[ \begin{array}{l}x+1=4\\x+1=-4\end{array} \right.\) <=> \(\left[ \begin{array}{l}x=3\\x=-5\end{array} \right.\) 
    Vậy x = 3 hoặc x = -5

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