Question

1/3.4+1/4.5+1/5.6+1/6.7+1/7.8

chỉ mình cách làm cụ thể luôn nha!

Answer 1

\(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}\)

=\(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}\)

=\(\frac{1}{3}-\frac{1}{8}\)

=\(\frac{8}{24}-\frac{3}{24}\)

=\(\frac{5}{24}\)

Answer 2

bằng 853/ 140 nhé bn!

Answer 3

= \(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+....+\frac{1}{7}-\frac{1}{8}\)

= \(\frac{1}{3}-\frac{1}{8}\)

= \(\frac{5}{24}\)

Answer 4

=1/3-1/4+1/4-1/5+...+1/7-1/8

=1/3-1/8

=5/24