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?????????1????
???????????
??? ??????
?????????8??24?? 1A.C.2
A.???????????
19C.??
6 h
?
B.???15 s??
100 m
?
B.
D.
D.???????625????????13 h 35 min???????
3????????3????????????????????????????? ????? ?
A.??????? B
C???????? D??????????
4???????????2????????????????F?????????????2m?s2????????F????????????2s?????????( ) A?2m?s B?4m?s C?6m?s D?8m?s
5??????A?B????????10 N???????????????0.3???? F?1 N???????????A?B??A?B????????B?B?A???????? ? A?0?1 NB?0?2 N C?6 N?1 N
D?1 N?1 N
6?2?????A?????B??B?????????A?B?????mA=6kg?mB=2kg?A?B?????????=0.2????F=10N????????????45N?????? [ ] A.???F?12N????????????
B.?????????????????12N????????
C.??????????????? D.????????????
7?????A?B??????m1?m2??????????????????????
A???????F????A???
B??????? ?
A.
m1m2
F B.FC.F
m1?m2m1?m2
D.
m1
F m2
8??????????????????????????s=24t-1.5t2(m)???????????t??? ? ? A?1.5s B?8sC?16s D?24s ?????????6??24??
9??????????????????? ? A???????????????B???????????? C?????????????????????D??????????????? 10?????m?????????F????????????????????t????v??????????2v?????????( )
A????????????1/2????????B???????2F???????? C??????2t????????D??????????????????????? 11????G??????????????????FN?????????? ????????F1??( )
A?F1?FN?G???B?F1?G????????
C?G???F1?????????F2
D?????G?FN?F1???????????????F2 12????????????????????? ?
A????????????????????????
B???????????????????????????????
C????????????????????
D??????????????????????????????????? 13?????????????v-t????????????????????????? ?
A??????????????????????????? B???????????
C???????????????????
D?????????????????????????? ???????
14?????????v-t????????? ? A???4s??????????? B??1~3 s???????????
C?3 s?????????5m/s???????????? D?2 ~3 s??3~4 s?????????? ?????
15??????????????????????????????????????????????????????cm??O?????????????A?B?C?D?????O?????????????????T=0.02 s?????
?1??????????????????????? ???????????? ? ?
?2?????????G???????????vG=_______________???????????G???????vG=____________m/s??????????????g=___________ ??????
16???????????30m/s????????????????5m/s???????????????
?1??????????8S????????????6?? ?2??????????????????????6??
17????500m?????????????g= 10m/s2??? ?1????????????
?2?????????????1s???????1s????? ?3??????????.
2
18????????60kg???????????????????????????????????????10kg???. ????a=2m/s???????????????? ?g?10m/s2?
19.??????????????37 ????????16m???????20m/s?????? 10m/s?????????.???????????????????0.5kg????????????????????0.5.?????????????????.sin37?0.6?
2
???????????
1.y=log0.5(4-x2) 0.5??? ?????
????,???????????,????????????. ??y=log0.5(4-x2) ???????-2,2?,??????????,???????,????0.5?1,??????????,?h=4?x^2,?h????????,?h????????,h=4?x^2????????,0?,?????0,+??,???????-2,2?,??????????????2,0?,???????0,2?.
2.??y=lg(mx^2-2x+1)?????R????m????? lg(mx^2-2x+1)?????R
?mx^2-2x+1>0?x?R????
(1)
?a=0 -2x+1>0???? (2)
?m>0 mx^2-2x+1>0?x?R????
???<0 4-4m<0
m>1
(3)
?m<0
???????????
???mx^2-2x+1>0?x?R????
????m>1
3.?0?x?1?a?0?a?1???|loga?1-x?|?|loga?1+x?|???
????a?1??
|loga?1-x?|=-loga?1-x??|loga?1+x?|=loga?1+x??
|loga?1-x?|-|loga?1+x?|=-[loga?1-x?+loga?1+x?]=-loga?1-x2?? ?a?1?0?1-x2?1??-loga?1-x2??0?
?|loga?1-x?|?|loga?1+x?|?
?0?a?1??
|loga?1-x?|=loga?1-x??|loga?1+x?|=-loga?1+x??
|loga?1-x?|-|loga?1+x?|=loga?1-x2??
?0?a?1?0?1-x2?1??loga?1-x2??0?
?|loga?1-x?|?|loga?1+x?|?
???0?x?1?a?0?a?1????|loga?1-x?|?|loga?1+x?|?
4.??????y=ax^2+bx+c(a>0)?[-b/2a,+?)?????.
??
=a(x1^2-x2^2)+b(x1-x2) =a((t1-b/2a)^2-(t2-b/2a^2))+b(t1-t2) =a(t1-t2)(t1+t2-b/a)+b(t1-t2) =(t1-t2)(at1+at2) >0,
??y=ax^2+bx+c(a>0)?[-b/2a,+?)?????.
5.??????R?????f(x),?x>0?,f(x)=x^2+x-1,???x=0
?,f(x)=______;?x?0?,f(x)=_____
???
?f?x??????R?????,
?f?-x)=-f(x),
?f(0)=0
???x>0?,f(x)=x^2+x+1,
??x?0?,-x?0,?f(-x)=?-x?^2+?-x?+1=x^2-x+1
?-f(x)=x^2-x+1,
?f(x)=-x^2+x-1,
???f(x)={x^2+x+1,x?0
0 ,x=0
-x^2+x-1,x?0
?x1=t1-b/2a,x2=t2-b/2a,t1>t2>0. ,y1-y2
6.????f(x)????,???(-??,0)?????,??f(x)?(0,???)????,??????? ??????f(x)????,???(-??,0)?????
???f(x)????,???(0,+??)?????
??????f(x)????
?f(-x)=f(x)
?0<x1<x2
f(-x1)=f(x1),f(-x2)=f(x2)
?f(x)?(-??,0)?????
-x1>-x2==>f(-x1)<f(-x2)==>f(x1)<f(x2)
???f(x)????,???(0,+??)?????
7.????f(x)=2^x-2^-x/2^x+2^-x???f(x)????????????????
f(x)=[2^x-2^(-x)]/[2^x+2^(-x)]=(2^x-1/2^x)/(2^x+1/2^x)=(4^x-1)/(4^x+1)=1-2/(4^x+1)?
(1)?x1<x2??4^x1<4^x2?
f(x1)-f(x2)=2(4^x1-4^x2)/[(4^x1+1)(4^x2+1)]<0??f(x1)<f(x2)??f(x)????????
(2)??4^x+1>0?R???????f(x)?????R?
4^x+1>1?0<1/(4^x+1)<1?-2<-2/(4^x+1)<0?-1<1-2/(4^x+1)<1???f(x)????(-1,1)?
8.???f?X?=?lgx???0<a<b,?f?a?>f?b?????ab<1 ????????1>b>a>0 ??????f(a)=-lga f(b?=-lgb f(a)+f(b)=-lgab ??f(a)>0 f(b)>0 ??lgab<0 ??ab<1
??????b>1>a>0 ??????f(a)=-lga f(b?=lgb ??f(a)>f(b) ??f(a)-f(b)=-lgab>0 ??lgab<0 ??ab<1
??????b>a>1 ?????????f(a)>f(b)
?? ab<1
9.??f(x)=x+1/x,???????x I x?0?
??,???????.
??????.
?,?x>0?,????????x+1/x?2?x(1/x)=2,????x1/x?,?x=1???,
?,?x<0?,-x>0?,???????-?x+1/x??2?-x(-1/x)=2,????-1,?x+1/x?-2.
????-x=-1/x,?x=-1????.
???????????????????,????.
??????f(x)=x+1/x????.
limx????x+1/x-x?=limx????1/x?=0,??????y=x???f(x)=x+1/x?????.
????
??f(x)=ax+b/x,a,b????????????,?????????f(x)=x+1/x?????f(x)=ax+b/x,a,b????.
?????????????,
limx????ax+b/x-ax?=limx????b/x?=0,????,??f(x)=ax+b/x?????y=ax.
f(x)=x+1/x D=(-???,0)?(0,+???)
???? ?(-???,-1)?(0,1)?????,(-1,0)?(1,+???)????? ???(-???,-2]?[2,+???)
f(x)=ax+b/x=a(x+b/ax) D=(-???,0)?(0,+???) ????
???x=b/ax???,?x=+-sqrt(b/a)
???(-???,-sqrt(b/a))?(0,sqrt(b/a))?????,(-sqrt(b/a),0)?(sqrt(b/a),+
???????????(???)
???????????
?????????????????????
1????????????????? ? ??
A???????????????
B???????????????
C???????????????????
D????????????????????????
2???????????????????????????????????????????????????? ??
A?A?????????B?B?????????
C?A??????? D?B???????
3??????????O???????????????????20m?????????O??25m?B???????????????????????????????????? ? ?
A?25m?25mB?65m?25m C?25m?-25mD?65m?-25m
4?????????????????? ??
A?????????80km/h????????
B??????????110km/h????????
C??????????????220km/h????????
D????900km/h????????????????
5??????????????????????( )
A???????????????????????
B????????????????????
C???????????????????????
D?????????????????
6?????????????v-t??????????????????????????
A???????????????????????????
B???????????
C???????????????????
D?????????????????????????????????
7??????????????????????O????1 m/s?????O??????7 m/s???????????O????????
A?5.5 m/s B?5m/sC?4 m/sD?3.5 m/s
8??????????A??????????????????
?????B?????v???C?????2v??xAB?xBC??
()
A?1?1B?1?2C?1?3D?1?4
29?????????????0.5m/s????????????1s????
A??????????????0.5m/sB???????????1s??????0.5m/s
C?????????1s??????0.5m/s D???????????????0.5?
10??????a???b??????????????a?b???????x?t????????? ?
A??t1???a?b????????
B??t1?t2??????b??????????
C??t1?t2??????b???????a???
D??t1?t2??????b???????a???
?????
11??????10m/s??????????????15m???????????????
2??????????????________s??????(?g=10m?s)
12??????????????????????????????????????????????
(1)??????????________??(??????)?????________V.
(2)?????????50??????????????????A???????vA?
2________m/s??????????????????????a=________m/s
?????
13??????72km/h????????????????????????2s????10m/s???
?1??????????? ?2????5s?????????
14??12??????????????????????????????27m?A?B???????2s?????B??????15m/s???
?1?????A?????????2?A??????????
215??12??????80 m?????????????g?10 m/s???
(1)??????????? (2)???????????1 s????1 s???????
???????????
?????
1????????????????????????????????????( )
A???????????????????????????????????????
B?????????????????????????????????????????
C?????????????????????
D????????????????????
2????????B???????B??????A???????????C??????????A???? ?
A????? B????????? C????????????
D???????????????????? 3?????????????????????????????
A????????????????????????? B??????????????????????????
C?????????????????????
D????????????????????????????????
4??????????????????????????????????????? ?
A
????????????? B??????????
C?????????????????
D?????????0?
180????????????
5????????A??????????F????A?B???????A??????( )
A?2 B?3 C?4D?5
6???A?B?C?????????????F?B??????????????? ?
A???A???B?????????? B???B???C?????????? C??????A?????????? D??????A??????????? 7?????F????????G?????????????????????
?????????? ? ?
A??F B??F+GC?G D?F2?G2
8?????????G????????????????????????????F??F???G?????????
? ? ? A.?????????F?????
B.???????????????
C.?????????????????????
D.????????????????????????
9????a ?b ?????????????????????100N/m ?200N/m ?????? 6cm?4cm ????????G?????????10N???? ? ?
A???a???????4N?b???????6N
B???a???????10N?b???????10N
C???a?????7cm?b?????4.5cm
D???a?????6.4cm?b?????4.3cm
10??????G?????????????????????????????????????f1 ?????????????? f2????????? ? ?
?????
11????????????L???f?????,???????
?1?????? ?
?2?????????
?3?????0.20m?,??????
12?????????????. AB????G??????A???
???C???????AB???????????AB????????
?????
13?????????m1?????????????????????O???OB???B?????????????m2?????????OA??????????37?????
2?????????(??sin37?0.6?cos37?0.8?tan37?0.75?g?10 m/s???
????????????)??(1)??OA?OB?????????(2)??????????????????(3)????????m2?4 kg???????????
???????0.3??????????????????????m1??
???????
14????????A?40N???B?20N?A?B?B?????????????B??????????F=32N?????A????????????????.
15????????????????????????????????????????????????????????????????????????????????v?
-42???????r????f=krv?k???????????????????k=3.410Ns/m?
332???????=1.010kg/m???????g=10m/s????r=0.10mm????????
?????????????????????
???????????
????????104=40??
1.?????????????? ?
A???????????????? B?????????????????
C?????????????????D????????????????
2.??????????????????????????????? ( )
A??????????????????
B???????????????????????????
C???????????????????????
D????????????????????????????
3????????????????????????????????????
????????????????a????????m???A???????
?????????( )
22A?g?a B?maC?mg2?a2D?m(g?a)
4??????????????????????????( )
A??????????????????????????????????
B?????????????????????????????
C????????????????????????????????????????????????????????????
D???????????????????????????????????
5.??????????????2 m?????????????????????????????0.5 m?????????????????????????????( )
A?5? B?6?C?8? D?10?
6.?????????????????????????P????????a???????????c???????????b??????????????????P???????c????( )
A???Pa?????????????????
B??ab???????????????????
C??bc???????????????????
D??c???????????????
7.???????????a?b????????a????????????Fa??b?????????Fb????????????????????????????????????????????????????????????? ?
A?Fa???Fb?? B?Fa?????Fb??
C?Fa???Fb?? D?Fa???Fb??
8.???????????????????a??????????????????????????F??? ?
A.????????B.???????a?????
???????????????
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发表于 2019-9-13 23:46:11