-2^4-[(-3)^2-( 1-2^3*5/4)÷(-2)]

=- 16-[9-(-9/-2)]=- 16-9/2=-4 1/2

1/ 1*3+ 1/3*5+...+ 1/99* 10 1

= 1/2( 1- 1/3+ 1/3- 1/5+ 1/5- 1/7+...+ 1/99- 1/ 10 1)

= 1/2*( 1- 1/ 10 1)

= 1/2* 100/ 10 1

=50/ 10 1