làm giúp mik với mik đang vội !
a) 1,75 – (-1/9 – 2 1/18 )
b) 1,25 x (-3 3/8 ) + 4/25
c) -1/24 – [1/4 -(1/2-7/8)]
d) (5/7 – 1/5) – [1/2 – ( -2/7 – 1/10)
e) (3- 1/4 +2/3) – (5- 1/3 – 6/5)
những số tương tự như 2 1/8 là hỗn số nha mn ! Cảm ơn mn rất nhìu !
a) 1,75 – (- $\frac{1}{9}$ – 2$\frac{1}{18}$)
= $\frac{7}{4}$ – (-$\frac{1}{9}$ – $\frac{37}{18}$)
= $\frac{7}{4}$ + ($\frac{13}{6}$)
= -$\frac{47}{12}$
b) 1,14 x (-3$\frac{3}{8}$) + $\frac{4}{25}$
= $\frac{57}{50}$ x (-$\frac{27}{8}$) + $\frac{4}{25}$
= -$\frac{1539}{400}$ + $\frac{4}{25}$
= -$\frac{59}{16}$
c) -$\frac{1}{24}$ – [$\frac{1}{4}$ – ($\frac{1}{2}$ – $\frac{7}{8}$)]
= -$\frac{1}{24}$ – ($\frac{1}{4}$ + $\frac{3}{8}$)
= -$\frac{1}{24}$ – $\frac{5}{8}$
= -$\frac{2}{3}$
d) ($\frac{5}{7}$ – $\frac{1}{5}$) – [$\frac{1}{2}$ – (-$\frac{2}{7}$ – $\frac{1}{10}$)]
= $\frac{18}{35}$ – ($\frac{1}{2}$ + $\frac{27}{70}$)
= $\frac{18}{35}$ – $\frac{31}{35}$
= -$\frac{13}{35}$
e) (3 – $\frac{1}{4}$ + $\frac{2}{3}$) – (5 – $\frac{1}{3}$ – $\frac{6}{5}$)
= $\frac{41}{12}$ – $\frac{52}{15}$
= -$\frac{1}{20}$
a) 1,75 – (-$\frac{1}{9}$ – 2$\frac{1}{18}$ )
=1.75 – (-$\frac{2}{18}$ -$\frac{37}{18}$ )
=$\frac{7}{4}$ -(- $\frac{13}{6}$ )
=$\frac{21+26}{12}$
=$\frac{47}{12}$
b)1,25 x (-3$\frac{3}{8}$ ) + $\frac{4}{25}$
=$\frac{5}{4}$ x (-$\frac{27}{8}$ ) + $\frac{4}{25}$
=( $\frac{5}{4}$ + $\frac{4}{25}$ )x( -$\frac{27}{8}$ + $\frac{4}{25}$ )
=$\frac{125+16}{100}$ x -$\frac{675+32}{200}$
=(-$\frac{3247}{800}$ )
c)-$\frac{1}{24}$ – [$\frac{1}{4}$ – ($\frac{1}{2}$ – $\frac{7}{8}$)]
=-$\frac{1}{24}$ – ($\frac{1}{4}$ – $\frac{1}{2}$ + $\frac{7}{8}$)
=-$\frac{1}{24}$ – $\frac{2-4+7}{8}$
=$\frac{-1-15}{24}$
=-$\frac{2}{3}$
d)($\frac{5}{7}$ – $\frac{1}{5}$ )-[($\frac{1}{2}$ -(-$\frac{2}{7}$ – $\frac{1}{10}$ )]
=($\frac{5}{7}$ – $\frac{1}{5}$ )-($\frac{1}{2}$ +$\frac{2}{7}$ +$\frac{1}{10}$ )
=$\frac{25-7}{35}$ – $\frac{35+20+7}{70}$
=-$\frac{13}{35}$
e)(3 – $\frac{1}{4}$ + $\frac{2}{3}$ ) – (5- $\frac{1}{3}$ – $\frac{6}{5}$ )
=$\frac{36-3+8}{12}$ – $\frac{75-5-18}{15}$
=$\frac{-1}{20}$