2.5X12.5X32-37-563 1/2001+2/2001+3/2001+~+2001/2001
=2.5x12.5x(4x8)-(37+563) =(1+2+3+……+2001)/2001
=(2.5x4)x(12.5x8)-600 =2001*(1+2001)/2001*2
=10x100-600 =1001
=1000-600
=400
2.5X12.5X32-37-563 1/2001+2/2001+3/2001+~+2001/2001
=2.5x12.5x(4x8)-(37+563) =(1+2+3+……+2001)/2001
=(2.5x4)x(12.5x8)-600 =2001*(1+2001)/2001*2
=10x100-600 =1001
=1000-600
=400