Đáp án:
Giải thích các bước giải:
a. $-\frac{3}{5}$ - $\frac{4}{15}$
= $-\frac{13}{15}$
b. $-\frac{3}{5}$ + $\frac{5}{7}$
= $\frac{4}{35}$
c. -75 + 52
= -23
d. -23 - 15 + 22
= -16
e. (49-2013)-(49+2017)
= -1964 - 2066
= -4030
f. $-\frac{15}{16}$ × $\frac{8}{-25}$
= $\frac{3}{10}$
g. $-\frac{21}{24}$ : $\frac{-14}{8}$
= $\frac{1}{2}$
h. $\frac{2}{5}$ + $\frac{3}{5}$ : ($\frac{3}{5}$ + $\frac{-2}{3}$ ) - $3\frac{1}{2}$
= $\frac{2}{5}$ + 1 - $\frac{9}{10}$ - $3\frac{1}{2}$
= $\frac{7}{5}$ - $\frac{13}{5}$
= $-\frac{6}{5}$
i. (4 - $\frac{5}{2}$) : 3 + $\frac{7}{36}$
= $\frac{3}{2}$ : 3 + $\frac{7}{36}$
= $\frac{1}{2}$ + $\frac{7}{36}$
= $\frac{25}{36}$
k. ( 15 - $6\frac{13}{18}$ ) : $11\frac{1}{27}$ - $2\frac{1}{8}$ : $1\frac{11}{40}$
= $-\frac{149}{18}$ : $11\frac{1}{27}$ - $\frac{5}{3}$
= $\frac{3}{4}$ - $\frac{5}{3}$
= $-\frac{11}{12}$
$chucbanhoktot$
$chomikxinctlhnnha$
