Bài 4 Tìm STN x a,131.x-941=27.$2^{4}$ a,131.x-941=27.$2^{4}$ b,[(x+32)-17].2=42 c,[($x^{2}$ + 54 )-32]:2=64

a) $131x-941=27.2^4$

$↔131x-941=27.16$

$↔131x-941=432$

$↔131x=432+941=1373$

$↔x=\dfrac{1373}{131}(ktm)$

b) $[(x+32)-17].2=42$

$↔(x+32)-17=42:2=21$

$↔x+32=21+17=38$

$↔x=38-32=6(tm)$

c) $[(x^2+54)-32]:2=64$

$↔(x^2+54)-32=64.2=128$

$↔x^2+54=128+32=160$

$↔x^2=160-54=106$

\(↔\left[ \begin{array}{l}x=\sqrt{106}(ktm)\\x=-\sqrt{106}(ktm)\end{array} \right.\)