h(100)=1008-101.1007+101.1006-...+101.1002-101.100+25
=1008-(100+1).1007+(100+1).1006-...+(100+1).1002-(100+1).100+25
=1008-1008-1007+1007+1006-...+1003+1002-1002-100+25
=(1008-1008)+(-1007+1007)+...+(1002-1002)+(-100+25)
=0+0+0+...+0-75=-75
Tick mk nhé