1/2×4+1/4×6+1/6×8+1/8×10......+1/98×100
1/2×4+1/4×6+1/6×8+1/8×10......+1/98×100
日期：2022-02-27 12:19:41 人气：1
1/2×4+1/4×6+1/6×8+1/8×10......+1/98×100
=1/4(1/1*2+1/2*3+1/3*4+...+1/49*50)
=1/4*[ (1-1/2) + (1/2-1/3) + (1/3-1/4) + ... + (1/49 - 1&#
=1/4(1/1*2+1/2*3+1/3*4+...+1/49*50)
=1/4*[ (1-1/2) + (1/2-1/3) + (1/3-1/4) + ... + (1/49 - 1&#