2 又1/2×5+4又1/5×8+……+100又1/149×152+102又1/152×155 一定要简算的!

2 又1/2×5+4又1/5×8+……+100又1/149×152+102又1/152×155 一定要简算的!
2 又1/2×5+4又1/5×8+……+100又1/149×152+102又1/152×155 一定要简算的!

2 又1/2×5+4又1/5×8+……+100又1/149×152+102又1/152×155 一定要简算的!
2又1/2x5+4 又1/5x8+6又 1/8x11+...+100又 1/149x152+102又 1/152x155
=（2+4+6+……+100+102）+（1/2-1/5+1/5-1/8+1/8-1/11+……+1/149-1/152+1/152-1/155）÷3
=（2+102）×51÷2+（1/2-1/155）÷3
=2652+51/310
=2652又51/310

2又1/2x5+4 又1/5x8+6又 1/8x11+...+100又 1/149x152+102又 1/152x155
=（2+102）×51÷2+（1/2-1/5+1/5-1/8+1/8-1/11+……+1/149-1/152+1/152-1/155）÷3
=2652+51/310
=2652又51/310

2又1/2x5+4 又1/5x8+6又 1/8x11+...+100又 1/149x152+102又 1/152x155=2652又51/310