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\(\left(19x+2.5^2\right):14=\left(13-8\right)^2-4^2\)
\(\Rightarrow\left(19x+50\right):14=25-16\)
\(\Rightarrow19x+50=9.14=126\)
\(\Rightarrow19x=76\)
\(\Rightarrow x=76:19=4\)
Ta có :
\(\frac{19x+2.5^2}{14}=\left(13-8\right)^2-4^2\)
\(\Leftrightarrow\)\(\frac{19x+2.25}{14}=5^2-4^2\)
\(\Leftrightarrow\)\(\frac{19x+50}{14}=25-16\)
\(\Leftrightarrow\)\(\frac{19x+50}{14}=9\)
\(\Leftrightarrow\)\(19x+50=126\)
\(\Leftrightarrow\)\(19x=76\)
\(\Leftrightarrow\)\(x=\frac{76}{19}\)
\(\Leftrightarrow\)\(x=4\)
Vậy \(x=4\)
câu b sai rồi,thế này mới đúng nè:
b,(19x+2.55):4=(13-8)2-42
(19x+2.52):14=52-42
(19x+2.52):14=8
19x+2.52+126
19x+50=126
19x=76
x=4
Ta có : \(\left(19x+2\cdot5^2\right):14=\left(13-8\right)^2-4\)
\(\Leftrightarrow\left(19x+2\cdot25\right):14=5^2-4\)
\(\Leftrightarrow\left(19x+50\right)=21\cdot14\)
\(\Leftrightarrow19x+50=294
\)
\(\Leftrightarrow19x=294-50\)
\(\Leftrightarrow x=\frac{244}{19}=12\frac{16}{19}\)
( 19x + 2 . 5\(^2\)) : 14 = ( 13 - 8 )\(^2\) - 4
( 19x + 2 . 25 ) : 14 = 5\(^2\)- 4
( 19x + 50 ) : 14 = 25 - 4
( 19x + 50 ) : 14 = 21
19x + 50 = 21 . 14
19x + 50 = 294
19x = 294 - 50
19x = \(\frac{244}{19}\)
( 19x + 2 . 52 ) : 14 = ( 13 - 8 )2 - 42
( 19x + 2 .25 ) : 14 = 52 - 42
( 19x + 100 ) : 14 = 25 - 16
( 19x + 100 ) : 14 = 9
( 19x + 100 ) = 76
19x = -24
x ko tìm đk
\(\Leftrightarrow\left(19x+50\right):14=5^2-4^2=9\)
=>19x+50=126
=>x=4
(19x+2.5^2):14=(13-8)^2-4^2
<=>( 19x+50) :14= 25-16
<=> (19x+50) :14=9
<=> 19x+50=9.14=126
<=> 19x=126-50=76
<=> x=76/9
( 19x + 50 ) : 14= 5^2 - 4^2
( 19x + 50 ) : 14 = 9
19x + 50 = 126
19x = 76
x = 76 : 19
x = 4 li-ke nha !!!!!!
a) ( 19x + 2.52 ) : 14 = ( 13 - 8 )2 - 42
<=> ( 19x + 2 . 25 ) : 14 = 25 - 16
<=> ( 19x + 50 ) : 14 = 9
<=> 19x + 50 = 9 . 14
<=> 19x + 50 = 126
<=> 19x = 126 - 50
<=> 19x = 76
<=> x = 76 : 19
<=> x = 4
a) ( 19x + 2.52 ) : 14 = ( 13 - 8 )2 - 42
<=> ( 19x + 2 . 25 ) : 14 = 25 - 16
<=> ( 19x + 50 ) : 14 = 9
<=> 19x + 50 = 9 . 14
<=> 19x + 50 = 126
<=> 19x = 126 - 50
<=> 19x = 76
<=> x = 76 : 19
<=> x = 4
~Chúc bn nào k mk học giỏi~
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( 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
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