498383582,你好:
1又1/2+2又1/6+3又1/12+4又1/20+5又1/30
=(1+2+3+4+5)+(1/2+1/6+1/12+1/20+1/30)
=15+1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=15+1/2+1/2-1/6
=15又5/6
498383582,你好:
1又1/2+2又1/6+3又1/12+4又1/20+5又1/30
=(1+2+3+4+5)+(1/2+1/6+1/12+1/20+1/30)
=15+1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=15+1/2+1/2-1/6
=15又5/6