a) $\frac{2}{3}$ + $\frac{5}{3}$.x= $\frac{5}{7}$
b) $\frac{1}{2}$ (x- $\frac{1}{3}$ ) + $\frac{-1}{2}$ = $\frac{3}{4}$
a) $\frac{2}{3}$ + $\frac{5}{3}$.x= $\frac{5}{7}$ b) $\frac{1}{2}$ (x- $\frac{1}{3}$ ) + $\frac{-1}{2}$ = $\frac{3}{4}$
By Liliana
a) `2/3 + 5/3 .x = 5/7`
`5/3 . x = 5/7 – 2/3`
`5/3 .x = 1/21`
`x = 1/21 : 5/3`
`x= 1/35`
b) `1/2 (x-1/3) + (-1)/2 = 3/4`
`1/2 (x-1/3) = 3/4 – (-1)/2`
`1/2 (x-1/3) = 5/4`
`x-1/3 = 5/4 : 1/2`
`x-1/3 = 5/2`
`x= 5/2 + 1/3`
`x= 17/6`
a, $\frac{2}{3}$ + $\frac{5}{3}$ .x= $\frac{5}{7}$
$\frac{5}{3}$.x= $\frac{5}{7}$ + $\frac{2}{3}$
$\frac{5}{3}$ .x= $\frac{1}{21}$
x = $\frac{1}{21}$ : $\frac{5}{3}$
x= $\frac{1}{35}$
Vậy x= $\frac{1}{35}$
b, $\frac{1}{2}$ .(x- $\frac{1}{3}$ )+ $\frac{-1}{2}$ = $\frac{3}{4}$
$\frac{1}{2}$ .(x- $\frac{1}{3}$ ) = $\frac{3}{4}$ – $\frac{-1}{2}$
$\frac{1}{2}$ .(x- $\frac{1}{3}$ ) =$\frac{5}{4}$
x-$\frac{1}{3}$ =$\frac{5}{4}$:$\frac{1}{2}$
x-$\frac{1}{3}$ = $\frac{5}{2}$
x = $\frac{5}{2}$+$\frac{1}{3}$
x = $\frac{17}{6}$
Vậy x= $\frac{17}{6}$
CHÚC BẠN HỌC TỐT!!!