@Hollwood#: @ TEAM_IQ_2000#:
Đáp án:
d) $\frac{1}{71}$
e) $\frac{-11}{7}$
f) $\frac{15}{2}$
g) $\frac{-1}{3}$
m) -6
Giải thích các bước giải:
d) $\frac{-1}{2}$-$\frac{-3}{5}$+$\frac{-1}{9}$+$\frac{1}{71}$-$\frac{-2}{7}$+$\frac{4}{35}$-$\frac{7}{18}$
= $\frac{-1}{2}$+$\frac{3}{5}$-$\frac{1}{9}$+$\frac{1}{71}$+$\frac{2}{7}$+$\frac{4}{35}$-$\frac{7}{18}$
= $\frac{-22365+26838-4970+630+12780+5112-17395}{44730}$
= $\frac{630}{44730}$
= $\frac{1}{71}$
e) ($\frac{5}{7}$-$\frac{7}{5}$)-[$\frac{1}{2}$-($\frac{-2}{7}$-$\frac{1}{10}$)]
= (-$\frac{24}{35}$)-[$\frac{1}{2}$-(-$\frac{27}{70}$)]
= -$\frac{24}{35}$-($\frac{1}{2}$+$\frac{27}{70}$)
= -$\frac{24}{35}$-$\frac{31}{35}$
= $\frac{-11}{7}$
f) 19$\frac{5}{8}$:$\frac{7}{12}$-15$\frac{1}{4}$:$\frac{7}{12}$
= $\frac{157}{8}$.$\frac{12}{7}$-$\frac{61}{4}$.$\frac{12}{7}$
= $\frac{157}{2}$.$\frac{3}{7}$-61.$\frac{3}{7}$
= $\frac{471}{14}$-$\frac{183}{7}$
= $\frac{15}{2}$
g) $\frac{2}{5}$.$\frac{1}{3}$-$\frac{2}{15}$:$\frac{1}{5}$+$\frac{3}{5}$.$\frac{1}{3}$
= $\frac{2}{15}$-$\frac{2}{15}$.5+$\frac{1}{5}$
= $\frac{2}{15}$-$\frac{2}{3}$+$\frac{1}{5}$
= $\frac{-1}{3}$
m) (3$\frac{1}{3}$+2,5):(3$\frac{1}{6}$-4$\frac{1}{5}$)-$\frac{11}{31}$
= ($\frac{10}{3}$+$\frac{5}{2}$):($\frac{19}{6}$-$\frac{21}{5}$)-$\frac{11}{31}$
= $\frac{35}{6}$:(-$\frac{31}{30}$)-$\frac{11}{31}$
= -35.$\frac{5}{31}$-$\frac{11}{31}$
= $\frac{-175}{31}$-$\frac{11}{31}$
= -6
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