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ij£
֪ͼ1rtbcУc=90㣬c=4cmbc=3cmpbb˶ٶΪ1cmsqɳcc˶ٶΪ2cmspq˶ʱts0t2
1tΪֵʱpqbc
2εycm&mpmpmpsup2yt֮ĺϵʽ
3Ƿijһʱtʹ߶pqǡðrtcbܳͬʱƽ֣ʱtֵ˵
4ͼ2pcpqcqcۣõıpqpcôǷijһʱtʹıpqpcΪΣڣʱⳤı߳˵ɡ
ɤûһ˿ԥ
1pq//bcʱ֪pqbc
С2t5t=45ãt=10/7
2ppdֱcdpdbcpb=pdbc
ԣ5t5=pd3pd=35t/5
y=1/2*2t*35t/5=3/5t^23t
3y=6y=3/5t^23tá6=3/5t^23t
ãt^25t10=0&mpmplt0Դ˷⣬ʱ̲
4ppdֱbcıpqp'cΣpdֱƽqc
d=442t/2=2tpdbc=pbpd3=5t5
pd=35t/5dc=pdbcԡ2t4=35t/53
ãt=10/9pd=7/3qd=2t=8/9ùɶpq=505/9
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