13. Tính tổng sau : a) 10 + 11/19 + 8/19 b) -13/24 + 2/7 + -11/24 c) 10/8 + -24/48 + -105/120

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1. `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)`$\frac{10}{8}$`+`$\frac{-24}{48}$`+` $\frac{-105}{120}$ 
     `=`$\frac{60}{48}$ `+“$\frac{-24}{48}$`+` $\frac{-105}{120}$ 
     `=`$\frac{3}{4}$ `+` $\frac{-105}{120}$ 
     `=`$\frac{90}{120}$ `+` $\frac{-105}{120}$ 
     `=`$\frac{-15}{120}$ 
     `=`$\frac{-1}{8}$ 

   Trả lời

2. a) 10 + $\frac{11}{19}$ + $\frac{8}{19}$ 

   $=10 + $( $\frac{11}{19}$ + $\frac{8}{19}$ )

   $= 10 +$ $\frac{19}{19}$ 

   $= 11$

   $b)$ $\frac{-13}{24}$ $+$ $\frac{2}{7}$ $+$ $\frac{-11}{24}$ 

   $=$ ( $\frac{-13}{24}$ $+$ $\frac{-11}{24}$ ) $+$ $\frac{2}{7}$

   $=$ $-1$ $+$ $\frac{2}{7}$

   $=$ $\frac{-5}{7}$ 

   $c)$ $\frac{10}{8}$ $+$ $\frac{-24}{48}$ $+$ $\frac{-105}{120}$ 

   $=$ $\frac{3}{4}$ $+$ $\frac{-105}{120}$ 

   $=$ $\frac{-1}{8}$ 

         $@YuuSaji$

    

   Trả lời