-(3/1*2)+(5/2*3)-(7/3*4)…+(201/100*101)-(203/101*102)
=-(1+1/2)+(1/2+1/3)-(1/3+1/4)…+(1/100+1/101)-(1/101+1/102)
=-1-1/102
=-103/102
-(3/1*2)+(5/2*3)-(7/3*4)…+(201/100*101)-(203/101*102)
=-(1+1/2)+(1/2+1/3)-(1/3+1/4)…+(1/100+1/101)-(1/101+1/102)
=-1-1/102
=-103/102