訓(xùn)8 偶?xì)?)
牡浴偶歉嚦氐鵲之一乇實(shí)應(yīng)酶突.要學(xué)式�，栈纬应�?
訓(xùn)懦
()知偶f(x)(0+)為f(2)=0,獠皇絝[log2(x2+5x+4)]0.
探
[1]知婧痜(x)嵌(-33)系募悴皇絝(x-3)+f(x2-3)<0,璨皇解集為AB=A{x|1x },g(x)=-3x2+3x-4(xB)值.
圖諍實(shí)酆目酆知識(shí)徒錛賭?
知識(shí)校要鶯去.
目式械摹f去訓(xùn)�，魏谮s抵凳毖?
敕腳既牛轉(zhuǎn)為xcos式謂轄屑值.
猓?x0,0
幀f(x)婧痜(x-3)<-f(x2-3)=f(3-x2),f(x)(-33)羌
x-3>3-x2,x2+x-6>0,x>2x<-3,系2
B=A{x|1x }={x|1x< },g(x)=-3x2+3x-4=-3(x- )2- 知g(x)B為g(x)max=g(1)=-4.
[2]知婧痜(x)畝為Rf(x)[0+)欠實(shí)m,使f(cos2-3)+f(4m-2mcos)>f(0)笑取[0, ]?冢實(shí)m姆圍冢說.
圖探�，要榭价簯驀`思維約目.
知識(shí)校要鶯牡院偶裕玫燃轉(zhuǎn)思敕階黑趕抵?
煤酆去�，乇卓玫燃转死O方.
敕揭等甲紀(jì)粉鄧?
猓篺(x)R系婧痆0+)f(x)R系.遣式傻燃鄣轉(zhuǎn)為f(cos2-3)>f(2mcos-4m),
cos2-3>2mcos-4m,cos2-mcos+2m-2>0.
t=cos,燃鄣轉(zhuǎn)為g(t)=t2-mt+2m-2=(t- )2- +2m-2[01]系值為轉(zhuǎn)為g(t)[01]系小值為.
嗟?<0,m<0時(shí)g(0)=2m-2>0 m>1m<0;
0 1時(shí)0m2時(shí)g(m)=- +2m-2>0
4-2
>1,m>2時(shí)g(1)=m-1>0 m>1.m>2
希目要m值冢取值圍m>4-2 .
訓(xùn)婕霸寄芬?/p>
(1)偶院偷去泄睪酆目.目要屑馭知識(shí)酆戲徒.
(2)應(yīng).煤偶院偷越實(shí)墓校要玫燃轉(zhuǎn)謂系思敕叫較贛∈階簡(jiǎn)單凳餃?乇牽煤牡實(shí)應(yīng)械值.
2017煽猓?/strong>2017爍嚦史憑學(xué)模
2017煽2017爍嚦時(shí)/
