Question

\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)
mong các bạn giúp mình

Answer 1

\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)

=\(\frac{1}{7}.\frac{15}{13}+\frac{1}{7}.\frac{5}{13}.12-\frac{1}{7}.\frac{10}{3}\)

=\(\frac{1}{7}\left(\frac{15}{13}+\frac{60}{13}+\frac{10}{3}\right)\)

=\(\frac{1}{7}\left(\frac{75}{13}-\frac{10}{3}\right)=\frac{1}{7}.\left(\frac{75.3-13.10}{39}\right)=\frac{1}{7}.\frac{95}{39}\)

=\(\frac{95}{273}\)

Answer 2

\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\frac{15}{13}+\frac{5.12}{13}.\frac{1}{7}-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\left(\frac{15}{13}+\frac{60}{13}\right)-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\frac{75}{13}-\frac{10}{21}\)

= \(\frac{75}{91}-\frac{10}{21}\)

= \(\frac{95}{273}\)

Answer 3

\(\frac{1}{7}.\frac{15}{13}+\frac{5}{13}.\frac{12}{7}-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\frac{15}{13}+\frac{1}{7}.\frac{5}{13}.12-\frac{1}{7}.\frac{10}{3}\)

= \(\frac{1}{7}.\left(\frac{15}{13}+\frac{60}{13}-\frac{10}{3}\right)\)

= \(\frac{1}{7}.\left(\frac{75}{13}-\frac{10}{3}\right)\)

= \(\frac{1}{7}.\frac{95}{39}\)

= \(\frac{95}{273}\).

Chúc bạn học tốt!