Toán a, x/8 + 3 = 1/5 x HELP ME , 1 CÂU THÔI 10Đ + VOTE +CLTLN 21/10/2021 By Ruby a, x/8 + 3 = 1/5 x HELP ME , 1 CÂU THÔI 10Đ + VOTE +CLTLN
a, $\frac{x}{8}+3=\frac{1}{5}x$
$\frac{1}{8}x-\frac{1}{5}x=-3$
$-\frac{3}{40}x=-3$
$x=40$
`x/8+3=1/5x`
`⇔(5x)/40+120/40=(8x)/40`
`⇔5x+120=8x`
`⇔120=3x`
`⇔x=40`