a, x+1/2=3/4 b, 4/5*x=4/7 c, 8x=7,8*x+25 (cho mình hỏi) 24/09/2021 Bởi Eloise a, x+1/2=3/4 b, 4/5*x=4/7 c, 8x=7,8*x+25 (cho mình hỏi)
a) ${x}$ + $\frac{1}{2}$ = $\frac{3}{4}$ ⇒ ${x}$ = $\frac{3}{4}$ – $\frac{1}{2}$ ⇒ ${x}$ = $\frac{1}{4}$ b) $\frac{4}{5}$ × ${x}$ = $\frac{4}{7}$ ⇒ ${x}$ = $\frac{4}{7}$ : $\frac{4}{5}$ ⇒ ${x}$ = $\frac{5}{7}$ c) 8${x}$ = 7,8${x}$ + 25 ⇒ 8${x}$ – 7,8${x}$ = 25 ⇒ 0,2${x}$ = 25 ⇒ ${x}$ = 125 Bình luận
a) `x+1/2 =3/4` `x=3/4 – 1/2` `x=1/4` b) `4/5 . x=4/7` `x=4/7 : 4/5` `x=5/7` c) `8.x = 7,8.x + 25` `8x-7,8x=25` `0,2x=25` `x=25 : 0,2` `x=125` Bình luận
a) ${x}$ + $\frac{1}{2}$ = $\frac{3}{4}$
⇒ ${x}$ = $\frac{3}{4}$ – $\frac{1}{2}$
⇒ ${x}$ = $\frac{1}{4}$
b) $\frac{4}{5}$ × ${x}$ = $\frac{4}{7}$
⇒ ${x}$ = $\frac{4}{7}$ : $\frac{4}{5}$
⇒ ${x}$ = $\frac{5}{7}$
c) 8${x}$ = 7,8${x}$ + 25
⇒ 8${x}$ – 7,8${x}$ = 25
⇒ 0,2${x}$ = 25
⇒ ${x}$ = 125
a) `x+1/2 =3/4`
`x=3/4 – 1/2`
`x=1/4`
b) `4/5 . x=4/7`
`x=4/7 : 4/5`
`x=5/7`
c) `8.x = 7,8.x + 25`
`8x-7,8x=25`
`0,2x=25`
`x=25 : 0,2`
`x=125`