赞 smallbee1003 花朵
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(9+2007/2008)*5=(9+1-1/2008)*5=49+1-5/2008=49又2003/2008
1/4+1/24+1/70+1/130+1/208
=6/24+1/24+(13+7)/910+1/208
=7/24+2/(13*7)+1/(13*16)
=7/24+(2*16+7)/(13*7*16)
=7/(3*8)+39/(13*14*8)
=7/(3*8)+3/(14*8)
=(7*14+3*3)/(3*14*8)
=107/336
1/4+1/24+1/70+1/130+1/208
=6/24+1/24+(13+7)/910+1/208
=7/24+2/(13*7)+1/(13*16)
=7/24+(2*16+7)/(13*7*16)
=7/(3*8)+39/(13*14*8)
=7/(3*8)+3/(14*8)
=(7*14+3*3)/(3*14*8)
=107/336
1年前
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