Question

1)  a) (7/4 . -4/5 +7/2 .-1/5) .50% -0,1 

b) (2 1/3 + 3 1/2 ) .0,2 +25% 

c) /2 / +/-5/-/-3/+2000^0

giúp zới , giúp zới

Answer 1

c) I 2I + I -5I - I-3I +2000^0 = 2+5-3+1=5

Answer 2

b)\(\left(2\frac{1}{3}+3\frac{1}{2}\right).0,2+25\%=\left(\frac{7}{3}+\frac{7}{2}\right).\frac{1}{5}+\frac{1}{4}=\left(\frac{14}{6}+\frac{21}{6}\right).\frac{1}{5}+\frac{1}{4}=\frac{35}{6}.\frac{1}{5}+\frac{1}{4}=\frac{7}{6}+\frac{1}{4}=\frac{14}{12}+\frac{3}{12}=\frac{17}{12}=1\frac{5}{12}\)

Answer 3

a) \(\left(\frac{7}{4}.\frac{-4}{5}+\frac{7}{2}.\frac{-1}{5}\right).50\%-0,1=\left(\frac{-7}{5}+\frac{-7}{10}\right).\frac{1}{2}-\frac{1}{10}=\left(-\frac{14}{10}+-\frac{7}{10}\right).\frac{1}{2}-\frac{1}{10}=\frac{-21}{10}.\frac{1}{2}-\frac{1}{10}=-\frac{21}{20}-\frac{1}{10}=-\frac{21}{20}-\frac{2}{20}=-\frac{23}{20}\)