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

Question

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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58 phút 2021-10-09T13:32:55+00:00 2 Answers 0 views 0

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

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

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

$= 10 +$ $\frac{19}{19}$

$= 11$

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

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

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

$=$ $\frac{-5}{7}$

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

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

$=$ $\frac{-1}{8}$

$@YuuSaji$