Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 6: Tìm x: a) (4x – 1) ³ = 27 b) 2 mũ x-1 + 3 ³ = 5 ² + 2 × 5

Toán Lớp 6: Tìm x:
a) (4x – 1) ³ = 27
b) 2 mũ x-1 + 3 ³ = 5 ² + 2 × 5

Comments ( 2 )

  1. Giải đáp:
    $\begin{array}{l}a. \ (4x-1)^3=27\\\rightarrow (4x-1)^3=3^3\\\rightarrow 4x-1=3\\\rightarrow 4x=4\\\rightarrow x=1\\\text{Vậy} \ x=1\\b. \ 2^{x-1}+3^3=5^2+2\times5\\\rightarrow 2^{x-1}+27=25+10\\\rightarrow 2^{x-1}+27=35\\\rightarrow 2^{x-1}=8\\\rightarrow 2^{x-1}=2^3\\\rightarrow x-1=3\\\rightarrow x=4\\\text{Vậy} \ x=4\end{array}$

Leave a reply

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