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!
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![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!](/uploads/image/z/3991016-56-6.jpg?t=2+%E5%8F%881%2F2%C3%975%2B4%E5%8F%881%2F5%C3%978%2B%E2%80%A6%E2%80%A6%2B100%E5%8F%881%2F149%C3%97152%2B102%E5%8F%881%2F152%C3%97155+%E4%B8%80%E5%AE%9A%E8%A6%81%E7%AE%80%E7%AE%97%E7%9A%84%21)
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