Question

tính giá trị biểu thức sau :

1 x 3 x 5 + 2 x 6 x 10 + 3 x 9 x 15/3 x 5 x 12 + 6 x 10 x 24 + 9 x 15 x 36

Answer 1

1 x 3 x 5 + 2 x 6 x 10 + 3 x 9 x 15/3 x 5 x 12 + 6 x 10 x 24 + 9 x 15 x 36 = 15 + 120 + 8100 + 1440 + 4860 = 14535

Answer 2

\(\frac{1\times3\times5+2\times6\times10+3\times9\times15}{3\times5\times12+6\times10\times24+9\times15\times36}\)

\(=\frac{1\times3\times5\times\left(1+2^3+3^3\right)}{3\times5\times12\times\left(1+2^3+3^3\right)}\)\(=\frac{1}{12}\)

Answer 3

=14535

Answer 4

14535