Question

a) 7 / 25 : 14 / 5 + 15 /4 x 1/ 5

b) 4 / 7 x 21/ 8 - 1/ 7: 14 / 5 

zúp mk nha . nhanh mk tick . thanks

Answer 1

\(a)\frac{7}{25}:\frac{14}{5}+\frac{15}{4}\times\frac{1}{5}\)

\(=\frac{7}{25}\times\frac{5}{14}+\frac{15}{4}\times\frac{1}{5}\)

\(=\frac{1}{10}+\frac{3}{4}\)

\(=\frac{17}{20}\)

\(b)\frac{4}{7}\times\frac{21}{8}-\frac{1}{7}:\frac{14}{5}\)

\(=\frac{4}{7}\times\frac{21}{8}-\frac{1}{7}\times\frac{5}{14}\)

\(=\frac{3}{2}-\frac{5}{98}\)

\(=\frac{71}{49}\)

Answer 2

b4/7x21/8-1/7:14/5

=4/7x21/8-1/7x5/14

=84/56-5/98

=3/2-5/98

=71/49

mk giải câu b thôi nha

Answer 3

a) 7/25:14/5+15/4x1/5

=7/25x5/14+3/4

=1/10+3/4

=17/20

b) 4/7x21/8-1/7:14/5

=3/2-1/7:5/14

=3/2-5/98

=71/49

Answer 4

\(\frac{7}{25}:\frac{14}{5}+\frac{15}{4}\times\frac{1}{5}\)

\(=\frac{7}{25}\times\frac{5}{14}+\frac{3}{4}\times\frac{1}{1}\)

\(=\frac{1}{5}\times\frac{1}{1}+\frac{3}{4}\)

\(=\frac{1}{5}+\frac{3}{4}\)

\(=\frac{4}{20}+\frac{15}{20}\)

\(=\frac{19}{20}\)

Answer 5

\(\frac{4}{7}\times\frac{21}{8}-\frac{1}{7}:\frac{14}{5}\)

\(=\frac{1}{1}\times\frac{3}{2}-\frac{1}{7}\times\frac{5}{14}\)

\(=\frac{3}{2}-\frac{5}{98}\)

\(=\frac{294}{196}-\frac{10}{196}\)

\(=\frac{284}{196}\)