原式=(99+97+95+……+1+0.5+0.5+0.5+……+0.5)-(98+96+94+……2+1/3+1/3+1/3+……1/3)
=((1+99)*50/2+1/2*50)-((98+2)*49/2+1/3*49)
=50*50+25-50*49-49/3
=50+8+2/3
=176/3
原式=(99+97+95+……+1+0.5+0.5+0.5+……+0.5)-(98+96+94+……2+1/3+1/3+1/3+……1/3)
=((1+99)*50/2+1/2*50)-((98+2)*49/2+1/3*49)
=50*50+25-50*49-49/3
=50+8+2/3
=176/3