Question

Bài 15: Thực hiện phép tính:

a) 0,2 : \(1\frac{3}{5}+80\%\)              b) 0,5 : \(\frac{5}{4}-2\frac{1}{5}\)

Answer 1

a)\(0,2:1\frac{3}{5}+80\%=\frac{1}{8}+80\%=\frac{3205}{32}\)

b)\(0,5:\frac{5}{4}-2\frac{1}{5}=\frac{2}{5}-\frac{11}{5}=-\frac{9}{5}\)

Answer 2

\(0,2:1\frac{3}{5}+80\%=\left(\frac{2}{10}+\frac{8}{5}\right)+80\%=\left(\frac{20}{100}+\frac{160}{100}\right)+80\%=\frac{180}{100}+80\%=180\%+80\%=260\%\)

Answer 3

 

\(0,5:\frac{5}{4}-2\frac{1}{5}=\frac{5}{10}.\frac{4}{5}-\frac{11}{5}=\frac{4}{10}-\frac{11}{5}=\frac{2}{5}+\frac{-11}{5}=\frac{-9}{5}\)

Answer 4

\(0,2:1\frac{3}{5}+80\%=\frac{2}{10}:\frac{8}{5}=\frac{1}{5}.\frac{5}{8}=\frac{1}{8}+80\%=\frac{1}{8}+\frac{80}{100}=\frac{5}{400}+\frac{320}{400}=\frac{325}{400}=\frac{13}{16}\)

Answer 5

\(\frac{1}{5}:\frac{8}{5}+\frac{80}{100}=\frac{1}{5}.\frac{5}{8}+\frac{4}{5}=\frac{1}{8}+\frac{4}{5}=\frac{37}{40}\)

con b tự làm nhé

Answer 6

mk lộn