Помогите решить: -1/2 * (-2/3) * (-3/4) * (-4/5)=

Question

Помогите решить:
-1/2 * (-2/3) * (-3/4) * (-4/5)=

Answer 1

-1/2 * (-2/3) * (-3/4) * (-4/5) = 1/3
1) -1/2 * (-2/3) = 2/6 = 1/3
2) (-3/4) * (-4/5) = 12/20 = 3/5
3) 1/3 * 3/5 = 3/15 = 1/3