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???2016????????????????
???????????????????????????????????2016???????????????????????????????????!???????????????C D D B A A C B B?????1 X1=0, x2=22 -1 3 1 45 ?? 6 -4 78 1cm 9 13?????1??? ??.2? , , ? , 3? 4???(1)???? ??? .??? ?????? .(2)? ? .? ?? ??? .? ???????.? ?? ??(1)? .?? ?? .
?????????1??????????x cm????2x cm????????????5 cm.??????5(x-10)(2x-10)=500. ?? x1=0,x2=15. 2x=215=30(cm).????????30 cm???15 cm.2?? ?2008??2010????????? x ?? ??? ? ? (??)??2008??2010?????????????? 30%??????????????2012????1200?????.3???(1)?????ABCD??AB?x????A?(80-x)?.???,?x(80-x)=750,?x2-80x+1500=0. ?????? x1=30,x2=50. ????????45 m,?x2=50????????.?x=30??(80-x)= (80-30)=25.???????????30 m???25 m??????????750 m2???????????????2016????????????????????????????????!!!
???2016?????????????????
??????????????????????????????????????????????????????????????????????????1. ???1A 2D 3A 4C2. ??(1)T=20-6h 20,6 T h h(2)Q=6x105-pt 6x105 p Q t 0?t?6x105/p(3)S=1.5b
(4) 0?x?7 0?y?5 5 03.???(1)y= Q/a-x Q/a (0?x?a)(2)y=80-2x20(3) ?-2?x?3??x=3,y?????1/2??-2?x?0?y?x????????0?x?3?y?x??????(4)?`v=800-50t?0?t?16??t=8? ? v=800-50x8=400??v=100??100=800-50tT=14???????????????????????????????????????????????!!!
???2014?????????(1???)
2014???????????? ???
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发表于 2019-9-13 23:46:11