Question

tính giá trị của biểu thức:

\(P=\frac{15}{5.8}+\frac{15}{8.11}+\frac{15}{11.14}+...+\frac{15}{92.95}\)

Answer 1

_Sai đề

Answer 2

Cái phân số cuối cùng phải là 15/92.95

Answer 3

15/5.8+15/8.11+15/11.14+...+15/92.95

=5.(3/5.8+3/8.11+3/11.14+...+3/92.95)

=5.(1/5-1/8+1/8-1/11+1/11-1/14+...+1/92-1/95)

=5.(1/5-1/95)

=5.(19/95-1/95)

=5.18/95=18/19

Answer 4

15/5.8+15/8.11+15/11.14+...+15/92.95

=5.(3/5.8+3/8.11+3/11.14+...+3/92.95)

=5.(1/5-1/8+1/8-1/11+1/11-1/14+...+1/92-1/95)

=5.(1/5-1/95)

=5.18/95

=18/19

Answer 5

15/5.8+15/8.11+15/11.14+...+15/92.95

=5.(3/5.8+3/8.11+3/11.14+...+3/92.95)

=5.(1/5-1/8+1/8-1/11+1/11-1/14+...+1/92-1/95)

=5.(1/5-1/95)

=5.18/95

=18/19