1.解析:(1)當(dāng)y1=y2時(shí).-x+2=3x-4.-4x=-6.x=. 當(dāng)y1>y2時(shí).-x+2>3x-4.-4x>-6.x<, 當(dāng)y1<y2時(shí).-x+2<3x-4.-4x<-6.x>. 查看更多

 

題目列表(包括答案和解析)

已知如圖,△AOB的OB邊在x軸上,∠OAB=90°,OA=AB=3
2
,反比例函數(shù)y1=
k
x
精英家教網(wǎng)A點(diǎn),一次函數(shù)y2=ax-b的圖象過A點(diǎn)且與反比例函數(shù)圖象的另一交點(diǎn)為C(-1,m),連接OC
(1)求出反比例函數(shù)與一次函數(shù)的解析式;
(2)求△OAC的面積;
(3)根據(jù)圖象,直接寫出當(dāng)y1≥y2時(shí),x的取值范圍.

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如圖,直線y1=-x-2交x軸于點(diǎn)A,交y軸于點(diǎn)B,拋物線y2=ax2+bx+c的頂點(diǎn)為A,且經(jīng)精英家教網(wǎng)過點(diǎn)B.
(1)求該拋物線的解析式;
(2)求當(dāng)y1≥y2時(shí)x的值.

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精英家教網(wǎng)如圖,反比例函數(shù)y1=
kx
的圖象與一次函數(shù)y2=mx+b的圖象交于A(1,3),B(n,-1)兩點(diǎn).
(1)求反比例函數(shù)與一次函數(shù)的解析式.
(2)根據(jù)圖象回答:①當(dāng)x<-3時(shí),寫出y1的取值范圍;②當(dāng)y1≥y2時(shí),寫出x的取值范圍.

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如圖,已知A(-4,0),B(-1,4),將線段AB繞點(diǎn)O,順時(shí)針旋轉(zhuǎn)90°,得到線段精英家教網(wǎng)A′B′.
(1)求直線BB′的解析式;
(2)拋物線y1=ax2-19cx+16c經(jīng)過A′,B′兩點(diǎn),求拋物線的解析式并畫出它的圖象;
(3)在(2)的條件下,若直線A′B′的函數(shù)解析式為y2=mx+n,觀察圖象,當(dāng)y1≥y2時(shí),寫出x的取值范圍.

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如圖所示,在直角坐標(biāo)系中,點(diǎn)A是反比例函數(shù)y1=
kx
(x>0)
的圖象上一點(diǎn),AB⊥x軸的正半軸于B點(diǎn),C是OB的中點(diǎn);一次函數(shù)y2=ax+b的圖象經(jīng)過A、C兩點(diǎn),并交y軸于點(diǎn)D(0,-2),若S△AOD=4.
(1)求反比例函數(shù)和一次函數(shù)的解析式;
(2)觀察圖象,請指出,當(dāng)y1≥y2時(shí),x的取值范圍.

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