Toán Lớp 6: Tìm số tự nhiên x, biết: (x – 12) . 45 = 2.48
Leave a reply
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.
Toán Lớp 6: Tìm số tự nhiên x, biết: (x – 12) . 45 = 2.48
Comments ( 2 )
$\Longrightarrow$ (x – 12) . $(2^{2})^5$ = 2 . $(2^{2})^8$
$\Longrightarrow$ x – 12 . $2^{10}$ = 2 . $2^{16}$
$\Longrightarrow$ x – 12 . $2^{10}$ = $2^{17}$
$\Longrightarrow$ x – 12 = $2^{17}$ : $2^{10}$
$\Longrightarrow$ x – 12 = $2^{7}$
$\Longrightarrow$ x – 12 = 128
$\Longrightarrow$ x = 128 + 12
$\Longrightarrow$ x = 140
Vậy x = 140