7$\frac{1}{3}$.($\frac{1}{6}$-$\frac{1}{2}$) ≤ x ≤ $\frac{3}{4}$.($\frac{1}{6}$-$\frac{1}{5}$-$\frac{1}{15}$) 20/08/2021 Bởi Everleigh 7$\frac{1}{3}$.($\frac{1}{6}$-$\frac{1}{2}$) ≤ x ≤ $\frac{3}{4}$.($\frac{1}{6}$-$\frac{1}{5}$-$\frac{1}{15}$)
Đáp án: `7 1/3 (1/6 – 1/2) ≤ x ≤ 3/4 (1/6 – 1/5 – 1/15)` `⇔ 22/3 . (-1)/3 ≤ x ≤ 3/4 . (-1)/10` `⇔ (-22)/9 ≤ x ≤ (-3)/40` `text{Vậy :}` `(-22)/9 ≤ x ≤ (-3)/40` Bình luận
$7$$\frac{1}{3}$.($\frac{1}{6}$-$\frac{1}{2}$)≤$x$≤$\frac{3}{4}$.( $\frac{1}{6}$-$\frac{1}{5}$-$\frac{1}{15}$) $\frac{22}{3}$.($\frac{1}{6}$-$\frac{3}{6}$)≤$x$≤$\frac{3}{4}$.( $\frac{5}{30}$-$\frac{6}{30}$-$\frac{2}{30}$) $\frac{22}{3}$.$\frac{-1}{3}$≤$x$≤$\frac{3}{4}$.$\frac{-1}{10}$ $\frac{-22}{9}$≤$x$≤$\frac{-3}{40}$. Bình luận
Đáp án:
`7 1/3 (1/6 – 1/2) ≤ x ≤ 3/4 (1/6 – 1/5 – 1/15)`
`⇔ 22/3 . (-1)/3 ≤ x ≤ 3/4 . (-1)/10`
`⇔ (-22)/9 ≤ x ≤ (-3)/40`
`text{Vậy :}` `(-22)/9 ≤ x ≤ (-3)/40`
$7$$\frac{1}{3}$.($\frac{1}{6}$-$\frac{1}{2}$)≤$x$≤$\frac{3}{4}$.( $\frac{1}{6}$-$\frac{1}{5}$-$\frac{1}{15}$)
$\frac{22}{3}$.($\frac{1}{6}$-$\frac{3}{6}$)≤$x$≤$\frac{3}{4}$.( $\frac{5}{30}$-$\frac{6}{30}$-$\frac{2}{30}$)
$\frac{22}{3}$.$\frac{-1}{3}$≤$x$≤$\frac{3}{4}$.$\frac{-1}{10}$
$\frac{-22}{9}$≤$x$≤$\frac{-3}{40}$.