Thu gọn biểu thức: A = 2y-x-{2x-y-[y+3x-15y-x)]} 02/11/2021 Bởi Reese Thu gọn biểu thức: A = 2y-x-{2x-y-[y+3x-15y-x)]}
$A = 2y-x-${$2x-y-[y+3x-(5y-x)]$} $= 2y – x -$ {$2x- y -[y + 3x – 5y + x]$} $= 2y – x – ${$2x-y – y -3x + 5y – x$} $= 2y – x -$ { $-2x + 3y$} $= 2y – x + 2x – 3y$ $= x – y $ Bình luận
$A = 2y-x-${$2x-y-[y+3x-(5y-x)]$}
$= 2y – x -$ {$2x- y -[y + 3x – 5y + x]$}
$= 2y – x – ${$2x-y – y -3x + 5y – x$}
$= 2y – x -$ { $-2x + 3y$}
$= 2y – x + 2x – 3y$
$= x – y $