锟斤拷锟斤拷一锟斤拷 锟斤拷(ji锟斤拷n)锟轿的撅拷锟斤拷規(gu锟斤拷)锟斤拷锟斤拷(w锟斤拷n)锟絵

锟斤拷锟斤拷锟斤拷(ji锟斤拷n)锟轿的撅拷锟斤拷規(gu锟斤拷)锟斤拷锟斤拷(w锟斤拷n)锟絵锟角高匡拷锟侥燂拷锟絚(di锟斤拷n)之一锟斤拷锟角歷锟斤拷呖锟斤拷谋乜锟斤拷锟�(n锟斤拷i)锟捷ｏ拷锟斤拷要锟斤拷锟斤拷锟斤拷}锟斤拷锟斤拷式锟斤拷锟斤拷锟筋優(y锟斤拷u)锟斤拷锟斤拷锟街碉拷(l锟斤拷i)锟斤拷(w锟斤拷n)锟絵锟斤拷锟斤拷锟�锟斤拷锟竭匡拷锟斤拷锟斤拷锟絵锟斤拷要锟斤拷锟紷锟斤拷锟铰幾傦拷(g锟斤拷)锟斤拷锟芥：

锟斤拷锟斤拷锟斤拷1锟斤拷 锟斤拷規(gu锟斤拷)锟侥撅拷锟斤拷規(gu锟斤拷)锟斤拷锟斤拷(w锟斤拷n)锟絵锟斤拷锟斤拷锟斤拷锟节撅拷锟皆約锟斤拷锟絣锟斤拷锟铰碉拷锟斤拷值锟斤拷(w锟斤拷n)锟絵锟斤拷

锟斤拷锟�锟斤拷锟�2锟斤拷 锟絚锟斤拷锟斤拷(sh锟斤拷)锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷知锟絉(sh锟斤拷)锟結(ji锟斤拷)锟较碉拷锟斤拷值锟�(l锟斤拷i)锟斤拷(w锟斤拷n)锟絵锟斤拷

锟斤拷锟�锟斤拷锟�3锟斤拷 锟斤拷锟节非撅拷锟皆約锟斤拷锟絣锟斤拷锟铰碉拷锟斤拷值锟斤拷(w锟斤拷n)锟絵锟斤拷

锟斤拷锟�锟斤拷锟�4锟斤拷 锟斤拷锟介線锟斤拷規(gu锟斤拷)锟斤拷锟斤拷(w锟斤拷n)锟絵锟节斤拷Q锟斤拷(sh锟斤拷)锟紿锟斤拷锟斤拷锟斤拷锟斤拷锟絘(ch锟斤拷n)锟斤拷(sh锟斤拷)锟紿锟叫的戯拷(y锟斤拷ng)锟矫ｏ拷锟斤拷锟斤拷锟叫的碉拷(2)(3)(4)锟絚(di锟斤拷n)锟斤拷锟斤拷锟斤拷锟斤拷锟絵锟侥勶拷(chu锟斤拷ng)锟斤拷锟絚(di锟斤拷n)锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷1锟斤拷 锟絆(sh锟斤拷)锟斤拷锟斤拷(sh锟斤拷)f(θ)=?3?sin?θ+??cos?θ锟斤拷锟斤拷锟叫ｏ拷锟斤拷θ锟斤拷锟斤拷c(di锟斤拷n)锟絚锟斤拷锟斤拷(bi锟斤拷o)原锟絚(di锟斤拷n)锟截猴拷锟斤拷始邊锟絚x锟絊锟斤拷負(f锟斤拷)锟斤拷锟絊锟截猴拷锟斤拷锟終邊锟斤拷(j锟斤拷ng)锟絕(gu锟斤拷)锟絚(di锟斤拷n)?P(x,y)?锟斤拷锟斤拷0≤θ≤?π?锟斤拷

锟斤拷锟斤拷(1) 锟斤拷锟絚(di锟斤拷n)P锟斤拷锟斤拷锟斤拷(bi锟斤拷o)锟斤拷12,32锟斤拷锟斤拷f(θ)锟斤拷值锟斤拷

锟斤拷锟斤拷(2) 锟斤拷锟絚(di锟斤拷n)P(x,y)锟斤拷平锟斤拷^(q锟斤拷)锟斤拷Ω锟斤拷x+y≥1,x≤1,y≤1锟斤拷 锟较碉拷一锟斤拷(g锟斤拷)锟斤拷(d锟斤拷ng)锟絚(di锟斤拷n)锟斤拷試锟絖锟斤拷锟斤拷θ锟斤拷取值锟斤拷锟斤拷锟斤拷锟斤拷锟襟函旓拷(sh锟斤拷)f(θ)锟斤拷锟斤拷小值锟斤拷锟斤拷锟街�锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷 锟斤拷(1)锟斤拷(w锟斤拷n)只锟斤拷要锟絓(y锟斤拷n)锟斤拷锟斤拷锟角猴拷锟斤拷(sh锟斤拷)锟侥讹拷锟絰锟斤拷锟缴ｏ拷锟斤拷(2)锟斤拷(w锟斤拷n)锟斤拷只要锟饺�锟�(hu锟斤拷)锟斤拷平锟斤拷^(q锟斤拷)锟斤拷Ω锟斤拷锟劫革拷锟斤拷(j锟斤拷)锟介畫(hu锟斤拷)锟斤拷锟斤拷平锟斤拷^(q锟斤拷)锟斤拷_锟斤拷锟斤拷θ锟斤拷取值锟斤拷锟斤拷锟斤拷锟組(j锟斤拷n)锟斤拷锟紻(zhu锟斤拷n)锟斤拷锟斤拷锟斤拷f(θ)=a?sin?θ+b?cos?θ锟酵猴拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷值锟斤拷

锟斤拷锟斤拷锟斤拷 (1) 锟斤拷锟絚(di锟斤拷n)P锟斤拷锟斤拷锟斤拷(bi锟斤拷o)锟斤拷锟斤拷锟角猴拷锟斤拷(sh锟斤拷)锟侥讹拷锟絰锟缴碉拷?sin?θ=32锟斤拷?cos?θ=12锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷f(θ)=3?sin?θ+??cos?θ=?3×32+12=2锟斤拷

锟斤拷锟斤拷(2) 锟斤拷锟斤拷平锟斤拷^(q锟斤拷)锟斤拷Ω (锟斤拷锟斤拷锟斤拷锟轿區(q锟斤拷)锟斤拷ABC)锟斤拷D锟斤拷示锟斤拷锟斤拷锟斤拷A(1,0)锟斤拷B(1,1)锟斤拷?C(0,1)?锟斤拷锟斤拷锟斤拷0≤θ≤?π?2,

锟斤拷锟斤拷锟斤拷f(θ)=3?sin?θ+?cos?θ=2?sin?θ+?π?6锟斤拷

锟斤拷锟斤拷锟斤拷?π?6≤θ+??π?6≤?2?π?3锟斤拷

锟斤拷锟斤拷锟绞�锟�(d锟斤拷ng)θ+?π?6=?π?2锟斤拷锟斤拷θ=?π?3锟絩(sh锟斤拷)锟斤拷f(θ)取锟斤拷锟斤拷锟街�锟斤拷锟斤拷锟斤拷锟街碉拷锟斤拷锟�2锟斤拷

锟斤拷锟斤拷锟斤拷(d锟斤拷ng)θ+?π?6=?π?6锟斤拷锟斤拷θ=0锟絩(sh锟斤拷)锟斤拷f(θ)取锟斤拷锟斤拷小值锟斤拷锟斤拷锟斤拷小值锟斤拷锟斤拷1锟斤拷

锟斤拷锟斤拷锟絚(di锟斤拷n)锟絬(p锟斤拷ng) 锟斤拷锟絵锟叫碉拷锟斤拷锟斤拷锟斤拷锟絚(di锟斤拷n)锟斤拷锟斤拷锟皆斤拷锟斤拷}锟斤拷锟斤拷式锟斤拷锟斤拷锟斤拷規(gu锟斤拷)锟斤拷锟叫的伙拷锟紸(ch锟斤拷)锟斤拷(n锟斤拷i)锟斤拷平锟斤拷^(q锟斤拷)锟斤拷锟絚锟斤拷锟角猴拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷值锟組(j锟斤拷n)锟斤拷锟剿碉拷锟叫機(j锟斤拷)锟紺锟斤拷锟斤拷锟絕(gu锟斤拷)去锟絭锟斤拷呖锟斤拷锟�(du锟斤拷)锟斤拷锟斤拷規(gu锟斤拷)锟斤拷锟斤拷锟斤拷锟叫诧拷锟斤拷锟斤拷見(ji锟斤拷n)锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷 锟斤拷锟斤拷锟斤拷锟斤拷式

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷式锟角诧拷锟斤拷式锟斤拷锟斤拷要锟斤拷(n锟斤拷i)锟斤拷,也锟角歷锟斤拷呖锟斤拷锟斤拷c(di锟斤拷n)锟斤拷锟斤拷锟街�锟絉(sh锟斤拷)之一锟斤拷锟斤拷锟侥戯拷(y锟斤拷ng)锟矫幾猴拷锟芥及锟斤拷锟叫旓拷(sh锟斤拷)锟絎(xu锟斤拷)锟斤拷锟斤拷锟叫碉拷锟铰癸拷(ji锟斤拷),锟竭匡拷锟斤拷锟絵锟斤拷锟斤拷锟絚(di锟斤拷n)锟角达拷小锟叫斷、锟斤拷锟斤拷值锟斤拷锟襟范囷拷锟饺ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟絵锟斤拷試锟絵锟斤拷锟統锟饺诧拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷母呖锟皆囷拷}锟斤拷也锟斤拷锟紽(xi锟斤拷n)锟剿诧拷锟劫匡拷锟斤拷锟斤拷锟斤拷锟斤拷锟绞斤拷膶锟�(sh锟斤拷)锟紿锟斤拷(y锟斤拷ng)锟矫嗭拷(w锟斤拷n)锟絵锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷2锟斤拷 锟斤拷锟斤拷W(xu锟斤拷)锟斤拷锟叫撅拷某位锟絎(xu锟斤拷)锟斤拷锟侥學(xu锟斤拷)锟斤拷(x锟斤拷)锟斤拷r锟絣(f锟斤拷)锟紽(xi锟斤拷n)锟斤拷锟斤拷锟紷位锟絎(xu锟斤拷)锟斤拷锟斤拷锟絎(xu锟斤拷)锟斤拷锟街�锟絉(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷1锟斤拷锟絫x 锟斤拷锟侥达拷锟斤拷锟斤拷y?1=4x+4锟斤拷锟斤拷锟斤拷t(t>0)锟斤拷r(sh锟斤拷)锟組(j锟斤拷n)锟叫碉拷一锟轿忥拷(f锟斤拷)锟斤拷(x锟斤拷)锟斤拷锟絫锟剿時(sh锟斤拷)锟紷锟狡猴拷锟斤拷锟斤拷锟斤拷锟斤拷未锟斤拷(f锟斤拷)锟斤拷(x锟斤拷)锟斤拷r锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷(f锟斤拷)锟斤拷(x锟斤拷)锟侥時(sh锟斤拷)锟絞锟斤拷锟皆诧拷計(j锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷y?2锟絊锟絩(sh锟斤拷)锟絞變锟斤拷锟斤拷锟斤拷锟斤拷恰锟矫烇拷直锟斤拷锟斤拷一锟斤拷锟街ｏ拷锟斤拷斜锟绞烇拷a(t+4)?2(?a

锟斤拷锟�锟斤拷锟�1锟斤拷 锟斤拷a=锟斤拷1,t=5锟斤拷锟斤拷“锟斤拷锟轿忥拷(f锟斤拷)锟斤拷(x锟斤拷)锟斤拷褧r(sh锟斤拷)锟紺(j锟斤拷)锟絚(di锟斤拷n)”锟斤拷

锟斤拷锟�锟斤拷锟�2锟斤拷 锟斤拷锟斤拷锟紽(xi锟斤拷n)锟斤拷“锟斤拷锟轿忥拷(f锟斤拷)锟斤拷(x锟斤拷)锟斤拷褧r(sh锟斤拷)锟紺(j锟斤拷)锟絚(di锟斤拷n)”锟斤拷锟斤拷a锟斤拷取值锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷 锟絇(gu锟斤拷n)锟絀锟角凤拷锟斤拷锟紻锟斤拷锟斤拷锟斤拷锟斤拷}目锟斤拷锟斤拷示锟侥猴拷锟絰锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷(sh锟斤拷)锟絇(gu锟斤拷n)系锟斤拷锟斤拷锟矫伙拷锟斤拷锟斤拷锟斤拷式锟斤拷锟斤拷值锟斤拷

锟斤拷锟斤拷锟斤拷 锟絆(sh锟斤拷)锟斤拷一锟轿忥拷(f锟斤拷)锟斤拷(x锟斤拷)锟斤拷拇锟斤拷锟斤拷锟斤拷c锟斤拷锟斤拷(f锟斤拷)锟斤拷(x锟斤拷)锟侥达拷锟斤拷锟斤拷之锟斤拷锟統锟斤拷

锟斤拷锟斤拷锟斤拷锟絵锟斤拷知锟斤拷y?2=a(t+4)?2(?x锟斤拷?t)+8t+4(?t>?4),

锟斤拷锟斤拷锟斤拷锟斤拷y=y?2锟斤拷y?1=a(t+4)?2(x锟斤拷t)+8t+4锟斤拷4x+4(t>4)锟斤拷

锟斤拷锟斤拷锟斤拷(d锟斤拷ng)a=锟斤拷1,t=5锟絩(sh锟斤拷)锟斤拷

锟斤拷锟斤拷y=锟斤拷1(5+4)?2(x锟斤拷5)+85+4锟斤拷4x+4

锟斤拷锟斤拷=锟斤拷(x+4)81锟斤拷4x+4+?1≤?锟斤拷2481+1=59锟斤拷

锟斤拷锟斤拷锟斤拷(d锟斤拷ng)锟揭僅锟斤拷(d锟斤拷ng)x=14 锟絩(sh锟斤拷)取锟斤拷號(h锟斤拷o)锟斤拷锟斤拷锟斤拷“锟斤拷锟轿忥拷(f锟斤拷)锟斤拷(x锟斤拷)锟斤拷褧r(sh锟斤拷)锟紺(j锟斤拷)锟絚(di锟斤拷n)”锟斤拷锟�14锟届．

锟斤拷锟斤拷(2) y=a(t+4)?2(x锟斤拷t)+8t+4锟斤拷4x+4?=锟斤拷锟斤拷a(x+4)(t+4)?2锟斤拷?4x+4+8t+4锟斤拷a(t+4)(t+4)?2?≤锟斤拷2锟斤拷4a(t+4)?2+?8锟斤拷at+4锟斤拷锟斤拷(d锟斤拷ng)锟揭僅锟斤拷(d锟斤拷ng)锟斤拷a(x+4)(t+4)?2?=4x+4?锟斤拷x=2锟斤拷a(t+4)锟斤拷4 锟絩(sh锟斤拷)取锟斤拷號(h锟斤拷o)锟斤拷

锟斤拷锟斤拷锟斤拷锟絵锟斤拷2锟斤拷a(t+4)锟斤拷4>t锟斤拷锟斤拷锟皆ｏ拷4

锟斤拷锟斤拷锟絚(di锟斤拷n)锟絬(p锟斤拷ng) 锟斤拷锟斤拷锟斤拷锟斤拷式锟斤拷每锟斤拷母呖锟斤拷袔缀锟斤拷菑牟锟饺毕�锟斤拷锟斤拷锟絇(gu锟斤拷n)锟絀锟斤拷要注锟斤拷锟絓(y锟斤拷n)锟矫伙拷锟斤拷锟斤拷锟斤拷式锟侥條锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷取锟�

锟斤拷锟斤拷锟斤拷锟斤拷 锟斤拷锟斤拷式锟斤拷锟斤拷锟�

锟斤拷锟斤拷锟斤拷锟斤拷3锟斤拷 锟斤拷(du锟斤拷)锟节嗭拷(w锟斤拷n)锟絵锟斤拷“锟斤拷知锟絇(gu锟斤拷n)锟斤拷x锟侥诧拷锟斤拷式ax?2+bx+c>0锟侥解集锟斤拷(锟斤拷1,2)锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷x锟侥诧拷锟斤拷式ax?2锟斤拷bx+c>0”锟斤拷锟給锟斤拷锟斤拷锟斤拷一锟絅锟解法锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟解法锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷x锟侥诧拷锟斤拷式kx+a+x+bx+c<0锟侥解集锟介－1,锟斤拷13∪12,1锟斤拷锟絫锟絇(gu锟斤拷n)锟斤拷x锟侥诧拷锟斤拷式kxax+1+bx+1cx+1<0锟侥解集锟斤拷? ? 锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷 锟絕锟斤拷l(f锟斤拷)锟紽(xi锟斤拷n)ax?2+?bx+?c>0锟斤拷x锟絈锟斤拷?锟斤拷x锟斤拷??a(锟斤拷x)?2+?b(锟斤拷x)+c>0锟斤拷锟絫锟解集也锟斤拷锟斤拷(y锟斤拷ng)變锟斤拷锟斤拷锟斤拷x∈(锟斤拷1,2)锟斤拷锟絫?x∈?(锟斤拷2,1)锟斤拷锟斤拷锟斤拷式kx+a+x+bx+c<0锟斤拷x锟絈锟斤拷1x锟矫诧拷锟斤拷式kxax+1+bx+1cx+1<0锟斤拷锟斤拷1x∈锟斤拷1,锟斤拷13∪12,1锟斤拷锟斤拷锟斤拷锟缴得达拷锟斤拷

锟斤拷锟斤拷锟斤拷 锟斤拷ax?2+bx+c>0锟侥解集锟斤拷(锟斤拷1,2)锟斤拷锟斤拷a(锟斤拷x)?2+b(锟斤拷x)+c>0锟侥解集锟斤拷(?锟斤拷2?,1)锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷x锟侥诧拷锟斤拷式ax?2锟斤拷bx+c>0锟侥解集锟斤拷(锟斤拷2,1)锟斤拷

锟斤拷锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷x锟侥诧拷锟斤拷式kx+a+x+bx+c<0锟侥解集锟介－1,?锟斤拷13?∪12,1

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