13. Tính tổng sau :
a) 10 + 11/19 + 8/19
b) -13/24 + 2/7 + -11/24
c) 10/8 + -24/48 + -105/120
13. Tính tổng sau : a) 10 + 11/19 + 8/19 b) -13/24 + 2/7 + -11/24 c) 10/8 + -24/48 + -105/120
By Adalyn
By Adalyn
13. Tính tổng sau :
a) 10 + 11/19 + 8/19
b) -13/24 + 2/7 + -11/24
c) 10/8 + -24/48 + -105/120
`a)“10“+`$\frac{11}{19}$`+`$\frac{8}{19}$
`=“10“+“(`$\frac{11}{19}$`+`$\frac{8}{19}$`)`
`=“10“+“1`
`=“11`
`b)`$\frac{-13}{24}$`+` $\frac{2}{7}$`+`$\frac{-11}{24}$
`=“(`$\frac{-13}{24}$`+`$\frac{-11}{24}$`)“+`$\frac{2}{7}$
`=“(-1)“+`$\frac{2}{7}$
`=`$\frac{-7}{7}$ `+`$\frac{2}{7}$
`=`$\frac{-5}{7}$
`c)`$\frac{10}{8}$`+`$\frac{-24}{48}$`+` $\frac{-105}{120}$
`=`$\frac{60}{48}$ `+“$\frac{-24}{48}$`+` $\frac{-105}{120}$
`=`$\frac{3}{4}$ `+` $\frac{-105}{120}$
`=`$\frac{90}{120}$ `+` $\frac{-105}{120}$
`=`$\frac{-15}{120}$
`=`$\frac{-1}{8}$
a) 10 + $\frac{11}{19}$ + $\frac{8}{19}$
$=10 + $( $\frac{11}{19}$ + $\frac{8}{19}$ )
$= 10 +$ $\frac{19}{19}$
$= 11$
$b)$ $\frac{-13}{24}$ $+$ $\frac{2}{7}$ $+$ $\frac{-11}{24}$
$=$ ( $\frac{-13}{24}$ $+$ $\frac{-11}{24}$ ) $+$ $\frac{2}{7}$
$=$ $-1$ $+$ $\frac{2}{7}$
$=$ $\frac{-5}{7}$
$c)$ $\frac{10}{8}$ $+$ $\frac{-24}{48}$ $+$ $\frac{-105}{120}$
$=$ $\frac{3}{4}$ $+$ $\frac{-105}{120}$
$=$ $\frac{-1}{8}$
$@YuuSaji$