Question

[Trần Minh Khánh]

Chứng minh :  51/2 x 52/2 x 53/2 x.......x 100/2 = 1 x 3 x 5 x 7 x.......x 99

Answer 1

[doremon]

1.3.5.7........99 = \(\frac{\left(1.3.5.7......99\right)\left(2.4.6......100\right)}{2.4.6......100}\)= \(\frac{1.2.3......99.100}{2^{50}\left(1.2.3.....50\right)}=\frac{51.52.53.......100}{2.2.2......2}=\frac{51}{2}.\frac{52}{2}....\frac{100}{2}\)(ĐPCM)

                                      50 số 2

Answer 2

[Brack Obama]

ko hiểu