Question

a) (15-121/18):297/27-17/8:51/40=?

b) (-3,2)×(-15/64 )+(0,8-34/15):11/3=?

c) 6/7+5/8:5-3/16×(-2) mũ 2=?

d) (-5/24+0,75+7/12):(-7/8)=?

Giúp mình với nha!!

Answer 1

a; (15 - \(\dfrac{121}{18}\)) : \(\dfrac{297}{27}\) - \(\dfrac{17}{8}\) : \(\dfrac{51}{40}\)

     (\(\dfrac{270}{18}\) - \(\dfrac{121}{18}\)) : \(\dfrac{297}{27}\) - \(\dfrac{17}{8}\) x \(\dfrac{40}{51}\)

 =   \(\dfrac{149}{18}\) : \(\dfrac{297}{27}\) - \(\dfrac{5}{3}\)

= \(\dfrac{149}{18}\) x \(\dfrac{27}{297}\) - \(\dfrac{5}{3}\)

 = \(\dfrac{149}{198}\) - \(\dfrac{5}{3}\)

= \(\dfrac{149}{198}\) - \(\dfrac{330}{198}\)

= \(\dfrac{-181}{198}\)

Answer 2

b; (- 3,2) x (- \(\dfrac{15}{64}\)) + (0,8 - \(\dfrac{34}{15}\)): \(\dfrac{11}{3}\)

= (\(\dfrac{-16}{5}\)) x ( \(\dfrac{-15}{64}\)) + (\(\dfrac{4}{5}\) - \(\dfrac{34}{15}\)): \(\dfrac{11}{3}\)

= \(\dfrac{3}{4}\) + (\(\dfrac{4}{5}\) - \(\dfrac{34}{15}\)): \(\dfrac{11}{3}\)

= \(\dfrac{3}{4}\) + (\(\dfrac{12}{15}\) - \(\dfrac{34}{15}\)) : \(\dfrac{11}{3}\)

= \(\dfrac{3}{4}\) + \(\dfrac{-22}{15}\) : \(\dfrac{11}{3}\)

= \(\dfrac{3}{4}\) - \(\dfrac{22}{15}\) x \(\dfrac{3}{11}\)

= \(\dfrac{3}{4}\) - \(\dfrac{2}{5}\)

= \(\dfrac{15}{20}\) - \(\dfrac{8}{20}\)

= \(\dfrac{7}{20}\)

Answer 3

c;   \(\dfrac{6}{7}\) + \(\dfrac{5}{8}\): 5 - \(\dfrac{3}{16}\) x (- 2)²

=   \(\dfrac{6}{7}\) +  \(\dfrac{5}{8}\) x \(\dfrac{1}{5}\) - \(\dfrac{3}{16}\) x 4

=  \(\dfrac{6}{7}\) + \(\dfrac{1}{8}\) - \(\dfrac{3}{4}\)

=   \(\dfrac{48}{56}\) + \(\dfrac{7}{56}\) - \(\dfrac{42}{56}\)

= \(\dfrac{55}{56}\) - \(\dfrac{42}{56}\)

=  \(\dfrac{13}{56}\)

Answer 4

d; (\(\dfrac{-5}{24}\) + 0,75 + \(\dfrac{7}{12}\)): (- \(\dfrac{7}{8}\))

= (\(\dfrac{-5}{24}\) + \(\dfrac{3}{4}\) + \(\dfrac{7}{12}\)) : (- \(\dfrac{7}{8}\))

= (\(\dfrac{-5}{24}\) + \(\dfrac{18}{24}\) + \(\dfrac{14}{24}\)): (- \(\dfrac{7}{8}\))

 = (\(\dfrac{13}{24}\) + \(\dfrac{14}{24}\)): (- \(\dfrac{7}{8}\))

=  \(\dfrac{27}{24}\) : - \(\dfrac{7}{8}\)

= \(\dfrac{27}{24}\) x ( \(\dfrac{-8}{7}\))

= - \(\dfrac{9}{7}\)