( 19x + 2.52 ) : 14 = ( 13 - 8 )2- 4 2
( 19x + 2.52 ) : 14 = 52- 4 2
( 19x + 2.52 ) : 14 = 25- 16
( 19x + 2.52 ) : 14 =9
( 19x + 50 ) : 14 =9
19x + 50=9 . 14
19x + 50=126
19x=126-50
19x=76
x=76:19
x=4
gan gon hon nha
(19x+2*5^2)/14=(13-8)^2-4^
(19x+2*25)/14=(13-8)^2-16
(19x+2.25)/14=5^-16
(19x+2.25)/14=25-16
(19+2.25)=9*14
19X=126+50
x=76/19
x=4
\(\left(19x+2.5^2\right):14=\left(13-8\right)^2-4^2\)
\(\left(19x+2.25\right):14=5^2-16\)
\(\left(19x+50\right):14=25-16\)
\(\left(19x+50\right):14=9\)
\(\left(19x+50\right)=9\times14=126\)
\(19x=126-50=76\)
\(x=76:19\)
\(x=4\)
\(\left(19x+2.5^2\right)\div14=\left(13-8\right)^2-4^2\)
\(\Leftrightarrow\left(19x+2.25\right)\div14=5^2-16\)
\(\Leftrightarrow\left(19x+50\right)\div14=25-16\)
\(\Leftrightarrow\left(19x+50\right)\div14=9\)
\(\Leftrightarrow19x+50=9.14\)
\(\Leftrightarrow19x+50=126\)
\(\Leftrightarrow19x=126-50\)
\(\Leftrightarrow19x=76\)
\(\Leftrightarrow x=76\div19\)
\(\Leftrightarrow x=4\)
Vậy x = 4