( 15 x 19 - x - 0,15 ) : 0,25 = 15 : 0,25
=> ( 15 x 19 - x - 0,15 ) x 4 = 15 x 4
=> 15 x 19 - x - 0,15 = 15 ( cùng bớt 4 lần ở cả 2 vế )
=> 269 - x - 0,15 = 15
=> 269 - x = 15 + 0,15
=> 269 - x = 15,15
=> x = 269 - 15,15
=> x = 269,85
https://www.youtube.com/watch?v=1-62NyxCwmM&feature=youtu.be
#)Giải :
\(\left(15\times19-x-0,15\right)\div0,25=15\div0,25\)
\(\Leftrightarrow\left(285-x-0,15\right)\div0,25=60\)
\(\Leftrightarrow285-x-0,15=15\)
\(\Leftrightarrow285-x=15,15\)
\(\Leftrightarrow x=269,85\)
( 15*19 - x - 0,15 ) : 0,25 = 15 : 0,25
( 15*19 - x - 0,15 ) = 15 : 0,25 * 0,25
15 * 19 - x - 0,15 = 15
285 - x - 0,15 = 15
285 - x = 15 + 0,15 = 15,15
x = 269,85
Vậy x = 269,85
(15x19-X-0,15):0,25=15:0,25
=>(15x19-X-0,15):0,25=60
=>15x19-X-0,15=60x0,25
=>15x19-X-0,15=15
=>15x19-X=15+0,15
=>285-X=15,15
=>X=285-15,15
=>X=269,86