tìm x biết rằng
2 . 5^2 . 3^2 + {[ 2 . 5^3 – ( 5x + 4 ) . 5 ] : ( 2^2 . 3 . 5 } = 453
tìm x biết rằng 2 . 5^2 . 3^2 + {[ 2 . 5^3 – ( 5x + 4 ) . 5 ] : ( 2^2 . 3 . 5 } = 453
By Raelynn
By Raelynn
tìm x biết rằng
2 . 5^2 . 3^2 + {[ 2 . 5^3 – ( 5x + 4 ) . 5 ] : ( 2^2 . 3 . 5 } = 453
$2 .5².3²+{[2.5³ – ( 5x + 4 ) . 5 ] : ( 2² . 3 . 5) } = 453$
$ 450 + {[2.5³ – ( 5x + 4 ) . 5 ] : ( 2² . 3 . 5) } = 453$
${[2.5³ – ( 5x + 4 ) . 5 ] : ( 2² . 3 . 5) } = 453 – 450 $
$[2.5³ – ( 5x + 4 ) . 5 ] : ( 2² . 3 . 5) = 3$
$[250 – ( 5x + 4 ) . 5 ] : 60 = 3$
$250 – ( 5x + 4 ) . 5 = 3 × 60$
$250 – ( 5x + 4 ) . 5 = 180$
$ ( 5x + 4 ) . 5 = 250 – 180 $
$ ( 5x + 4 ) . 5 = 70 $
$5x + 4 = 70 : 5$
$5x + 4 = 14$
$5x = 14 – 4$
$5x = 10$
$x = 10 : 5$
$x = 2 $
⇒ X = 2
2.$5^{2}$ .$3^{2}$ + {[ 2 . $5^{3}$ – ( 5x + 4 ) . 5 ] : ( $2^{2}$ . 3 . 5 } = 453
450-[250-(5.x+4).5]:60=453
[250-(5.x+4).5]:60=453-450
[250-(5.x+4).5]:60=3
250-(5.x+4).5=3.60
250-(5.x+4).5=180
(5.x+4).5=250-180
(5.x+4).5=70
5.x+4=70:5
5.x+4=14
5.x=14-4
5.x=10
x=10:5
x=2