a) ($\frac{3}{8}$+ $\frac{-3}{4}$+ $\frac{7}{12}$):$\frac{5}{6}$+ $\frac{1}{2}$
=($\frac{18}{48}$+ $\frac{-36}{48}$+ $\frac{28}{48}$):$\frac{5}{6}$+ $\frac{1}{2}$
= $\frac{5}{24}$ :$\frac{5}{6}$ +$\frac{1}{2}$
=$\frac{5}{24}$ .$\frac{6}{5}$ +$\frac{1}{2}$
=$\frac{1}{4}$ + $\frac{1}{2}$
=$\frac{1+2}{4}$
=$\frac{3}{4}$
b)$\frac{12}{17}$ .$\frac{-7}{23}$ -$\frac{12}{17}$ .$\frac{10}{23}$ +$\frac{-11}{23}$
=$\frac{12}{17}$ .($\frac{-7}{23}$ -$\frac{10}{23}$ +$\frac{-11}{23}$)
=$\frac{12}{17}$ .$\frac{-27}{23}$
=$\frac{-324}{391}$
c) ($\frac{-2}{3}$)$^{2}$ - $\frac{62}{5}$ :$\frac{31}{8}$ .$\frac{1}{4}$
=$\frac{4}{9}$ -$\frac{62}{5}$ .$\frac{8}{31}$ .$\frac{1}{4}$
=$\frac{4}{9}$ -$\frac{4}{5}$
=$\frac{56}{45}$
d)$\frac{11}{5}$ .$\frac{2}{7}$ +2$\frac{1}{5}$ .$\frac{-6}{7}$ -2,2ư
=$\frac{11}{5}$ .$\frac{2}{7}$ +$\frac{11}{5}$ .$\frac{-6}{7}$ -$\frac{22}{10}$
=$\frac{11}{5}$. ( $\frac{2}{7}$ +$\frac{-6}{7}$ -$\frac{22}{10}$ )
=$\frac{11}{5}$ .($\frac{-4}{7}$ -$\frac{22}{10}$ )
=$\frac{11}{5}$ .$\frac{57}{35}$
=$\frac{627}{175}$
e)$\frac{5}{16}$ :0,125-(2$\frac{1}{4}$ -0,6).$\frac{10}{11}$
=$\frac{5}{16}$ :$\frac{1}{8}$ -($\frac{9}{4}$ -$\frac{3}{5}$). $\frac{10}{11}$
=$\frac{5}{16}$ .8-$\frac{33}{45}$ .$\frac{10}{11}$
=$\frac{5}{2}$ -$\frac{110}{165}$
=$\frac{605}{330}$
f)1$\frac{13}{15}$ .0,75-($\frac{11}{20}$ +25%):$\frac{7}{3}$
=$\frac{28}{15}$ .$\frac{3}{4}$ -($\frac{11}{20}$+ $\frac{1}{4}$).$\frac{3}{7}$
=$\frac{7}{5}$ -$\frac{4}{5}$ .$\frac{3}{7}$
=$\frac{7}{5}$ -$\frac{12}{35}$
=$\frac{37}{35}$
cho mik xin 5* và ctlhn
@chúc bn hoc tốt
