A)15/12+5/13-3/12-18/13 B)13/25+6/41-38/25+35/41-1/2 C)16/41+15/23-3/2+25/41-38/23 D)15.(-2/3^2)+11/3 03/11/2021 Bởi Madeline A)15/12+5/13-3/12-18/13 B)13/25+6/41-38/25+35/41-1/2 C)16/41+15/23-3/2+25/41-38/23 D)15.(-2/3^2)+11/3
Giải thích các bước giải: $a,$ $\frac{15}{12}$ + $\frac{5}{13 }$ – $\frac{3}{12}$ – $\frac{18}{13}$ $=$ ($\frac{15}{12}$ – $\frac{3}{12}$) + ($\frac{5}{13}$ – $\frac{18}{13}$) $= 1 + (-1)$ $=0$ $b,$ $\frac{13}{25}$ + $\frac{6}{41}$ – $\frac{38}{25}$ + $\frac{35}{41}$ – $\frac{1}{2}$ $=$ ($\frac{13}{25}$ – $\frac{38}{25}$) + ($\frac{6}{41}$ + $\frac{35}{41}$) – $\frac{1}{2}$ $= (-1)+ 1-$ $\frac{1}{2}$ $=$ $\frac{-1}{2}$ $c, $$\frac{16}{41}$ + $\frac{15}{23}$ – $\frac{3}{2}$ + $\frac{25}{41}$ – $\frac{38}{23}$ $=$ ($\frac{16}{41}$ + $\frac{25}{41}$) + ($\frac{15}{23}$ – $\frac{38}{23}$) – $\frac{3}{2}$ $= 1 + (-1) $ – $\frac{3}{2}$ $=$ $\frac{-3}{2}$ $d,15.$$\frac{-2}{3²}$ + $\frac{11}{3}$ $= 15.$$\frac{-2}{9}$ + $\frac{11}{3}$ $=$ $\frac{-10}{3}$ + $\frac{11}{3}$ $=$ $\frac{1}{3}$ Bình luận
$A)$ `15/12+5/13-3/12-18/13` `=({15}/{12}-3/{12})+(5/{13}-{18}/{13})` `=1+(-1)` `=0` $\\$ $B)$ ` 13/25+ 6/41- 38/25 + 35/41 -1/ 2` `=({13}/{25}-{38}/{25})+(6/{41}+{35}/{41})- 1/ 2` `=-1+1- 1/ 2` `=-1/ 2` $\\$ $C) $ ` 16/41 + 15/23 – 3/2 + 25/41 – 38/23` `=({16}/{41}+{25}/{41})+({15}/{23}-{38}/{23})- 3/ 2` `=1+( -1) – 3/ 2` `=-3/ 2` $\\$ $D)$ `15.(-2/3^2)+11/3` `=15 . {-2)/9 +{11}/3` `={-10}/ 3 + {11}/ 3` `= 1/ 3` Bình luận
Giải thích các bước giải:
$a,$ $\frac{15}{12}$ + $\frac{5}{13 }$ – $\frac{3}{12}$ – $\frac{18}{13}$ $=$ ($\frac{15}{12}$ – $\frac{3}{12}$) + ($\frac{5}{13}$ – $\frac{18}{13}$) $= 1 + (-1)$ $=0$
$b,$ $\frac{13}{25}$ + $\frac{6}{41}$ – $\frac{38}{25}$ + $\frac{35}{41}$ – $\frac{1}{2}$ $=$ ($\frac{13}{25}$ – $\frac{38}{25}$) + ($\frac{6}{41}$ + $\frac{35}{41}$) – $\frac{1}{2}$ $= (-1)+ 1-$ $\frac{1}{2}$ $=$ $\frac{-1}{2}$
$c, $$\frac{16}{41}$ + $\frac{15}{23}$ – $\frac{3}{2}$ + $\frac{25}{41}$ – $\frac{38}{23}$ $=$ ($\frac{16}{41}$ + $\frac{25}{41}$) + ($\frac{15}{23}$ – $\frac{38}{23}$) – $\frac{3}{2}$ $= 1 + (-1) $ – $\frac{3}{2}$ $=$ $\frac{-3}{2}$
$d,15.$$\frac{-2}{3²}$ + $\frac{11}{3}$ $= 15.$$\frac{-2}{9}$ + $\frac{11}{3}$ $=$ $\frac{-10}{3}$ + $\frac{11}{3}$ $=$ $\frac{1}{3}$
$A)$ `15/12+5/13-3/12-18/13`
`=({15}/{12}-3/{12})+(5/{13}-{18}/{13})`
`=1+(-1)`
`=0`
$\\$
$B)$ ` 13/25+ 6/41- 38/25 + 35/41 -1/ 2`
`=({13}/{25}-{38}/{25})+(6/{41}+{35}/{41})- 1/ 2`
`=-1+1- 1/ 2`
`=-1/ 2`
$\\$
$C) $ ` 16/41 + 15/23 – 3/2 + 25/41 – 38/23`
`=({16}/{41}+{25}/{41})+({15}/{23}-{38}/{23})- 3/ 2`
`=1+( -1) – 3/ 2`
`=-3/ 2`
$\\$
$D)$ `15.(-2/3^2)+11/3`
`=15 . {-2)/9 +{11}/3`
`={-10}/ 3 + {11}/ 3`
`= 1/ 3`