A=2/5+(-4/3)+(-1/2) B=1/3-[(-5/4)-(1/4+3/8)] 06/09/2021 Bởi Reagan A=2/5+(-4/3)+(-1/2) B=1/3-[(-5/4)-(1/4+3/8)]
$A=\dfrac{2}{5}-\dfrac{4}{3}-\dfrac{1}{2}$ $=-\dfrac{14}{15}-\dfrac{1}{2}$ $=-\dfrac{43}{30}$ $B= \dfrac{1}{3}-(-\dfrac{5}{4}-\dfrac{1}{4}-\dfrac{3}{8})$ $= \dfrac{1}{3}-(-\dfrac{3}{2}-\dfrac{3}{8})$ $=\dfrac{1}{3}-(-\dfrac{15}{8})$ $=\dfrac{1}{3}+\dfrac{15}{8}$ $=\dfrac{53}{24}$ Bình luận
Đáp án: $\text{ A = $\dfrac{2}{5}$ + ($\dfrac{-4}{3}$) + ( $\dfrac{-1}{2}$) }$ $\text{ = $\dfrac{12}{30}$ + ( $\dfrac{-40}{30}$) + ($\dfrac{-15}{30}$ ) }$ $\text{ = $\dfrac{-43}{30}$ }$ $\text{B = $\dfrac{1}{3}$ – [ ($\dfrac{-5}{4}$) – ($\dfrac{1}{4}$ + $\dfrac{3}{8}$) ] }$ $\text{ = $\dfrac{1}{3}$ – [ $\dfrac{-5}{4}$ – $\dfrac{5}{8}$ ] }$ $\text{ = $\dfrac{1}{3}$ – ($\dfrac{-15}{8}$) }$ $\text{ = $\dfrac{1}{3}$ + $\dfrac{15}{8}$ }$ $\text{ = $\dfrac{53}{24}$ }$ Bình luận
$A=\dfrac{2}{5}-\dfrac{4}{3}-\dfrac{1}{2}$
$=-\dfrac{14}{15}-\dfrac{1}{2}$
$=-\dfrac{43}{30}$
$B= \dfrac{1}{3}-(-\dfrac{5}{4}-\dfrac{1}{4}-\dfrac{3}{8})$
$= \dfrac{1}{3}-(-\dfrac{3}{2}-\dfrac{3}{8})$
$=\dfrac{1}{3}-(-\dfrac{15}{8})$
$=\dfrac{1}{3}+\dfrac{15}{8}$
$=\dfrac{53}{24}$
Đáp án:
$\text{ A = $\dfrac{2}{5}$ + ($\dfrac{-4}{3}$) + ( $\dfrac{-1}{2}$) }$
$\text{ = $\dfrac{12}{30}$ + ( $\dfrac{-40}{30}$) + ($\dfrac{-15}{30}$ ) }$
$\text{ = $\dfrac{-43}{30}$ }$
$\text{B = $\dfrac{1}{3}$ – [ ($\dfrac{-5}{4}$) – ($\dfrac{1}{4}$ + $\dfrac{3}{8}$) ] }$
$\text{ = $\dfrac{1}{3}$ – [ $\dfrac{-5}{4}$ – $\dfrac{5}{8}$ ] }$
$\text{ = $\dfrac{1}{3}$ – ($\dfrac{-15}{8}$) }$
$\text{ = $\dfrac{1}{3}$ + $\dfrac{15}{8}$ }$
$\text{ = $\dfrac{53}{24}$ }$