Question

Bài 1:

a)  5/8+ 3/8: 3/5

b)  7/9* 5/19+ 7/9* 12/19

c)  5/21* 14/15+ 1/1/6

Bài 2:

a)  x- 20%=2

b) 3/2-x=1/1/4

Giúp mik nhé!!!!!!

Answer 1

a)\(\frac{5}{8}+\frac{3}{8}:\frac{3}{5}\)

\(=\frac{5}{8}+\frac{5}{8}\)

\(=\frac{5}{4}\)

b)\(\frac{7}{9}.\frac{5}{19}+\frac{7}{9}.\frac{12}{19}\)

\(=\frac{7}{9}.\left(\frac{5}{19}+\frac{12}{19}\right)\)

\(=\frac{7}{9}.\frac{17}{19}\)

\(=\frac{119}{171}\)

c)\(\frac{5}{21}.\frac{14}{15}+\frac{1}{\frac{1}{6}}\)

\(=\frac{2}{9}+6\)

\(=\frac{58}{9}\)

d)\(\frac{3}{2}-x=\frac{1}{\frac{1}{4}}\)

\(\frac{3}{2}-x=4\)

\(x=\frac{3}{2}-4\)

\(x=\frac{-5}{2}\)

chúc bạn học tốt nha