②若一拋物線y=x2+mx經(jīng)過動(dòng)點(diǎn)E.當(dāng)S<2時(shí).求m的取值范圍. 查看更多

 

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如圖,在平面直角坐標(biāo)系中,點(diǎn)A(
3
,0),B(3
3
,2),C(0,2).動(dòng)點(diǎn)D以每秒1個(gè)單位的速度從點(diǎn)O出發(fā)沿OC向終點(diǎn)C運(yùn)動(dòng),同時(shí)動(dòng)點(diǎn)E以每秒2個(gè)精英家教網(wǎng)單位的速度從點(diǎn)A出發(fā)沿AB向終點(diǎn)B運(yùn)動(dòng).過點(diǎn)E作EF⊥AB,交BC于點(diǎn)F,連接DA、DF.設(shè)運(yùn)動(dòng)時(shí)間為t秒.
(1)求∠ABC的度數(shù);
(2)當(dāng)t為何值時(shí),AB∥DF;
(3)設(shè)四邊形AEFD的面積為S.①求S關(guān)于t的函數(shù)關(guān)系式;
②若一拋物線y=-x2+mx經(jīng)過動(dòng)點(diǎn)E,當(dāng)S<2
3
時(shí),求m的取值范圍(寫出答案即可).

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如圖,在平面直角坐標(biāo)系中,點(diǎn)A(
3
,0),B(3
3
,2),C(0,2).動(dòng)點(diǎn)D以每秒1個(gè)單位的速度從點(diǎn)0出發(fā)沿OC向終點(diǎn)C運(yùn)動(dòng),同時(shí)動(dòng)點(diǎn)精英家教網(wǎng)E以每秒2個(gè)單位的速度從點(diǎn)A出發(fā)沿AB向終點(diǎn)B運(yùn)動(dòng).過點(diǎn)E作EF上AB,交BC于點(diǎn)F,連接DA,DF.設(shè)運(yùn)動(dòng)時(shí)間為t秒.
(1)求∠ABC的度數(shù);
(2)當(dāng)t為何值時(shí),AB∥DF;
(3)設(shè)四邊形AEFD的面積為S.
①求S關(guān)于t的函數(shù)關(guān)系式;②若一拋物線y=x2+mx經(jīng)過動(dòng)點(diǎn)E,當(dāng)S<2
3
時(shí),求m的取值范圍(寫出答案即可).

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(2009•溫州)如圖,在平面直角坐標(biāo)系中,點(diǎn)A(,0),B(3,2),C(0,2).動(dòng)點(diǎn)D以每秒1個(gè)單位的速度從點(diǎn)O出發(fā)沿OC向終點(diǎn)C運(yùn)動(dòng),同時(shí)動(dòng)點(diǎn)E以每秒2個(gè)單位的速度從點(diǎn)A出發(fā)沿AB向終點(diǎn)B運(yùn)動(dòng).過點(diǎn)E作EF上AB,交BC于點(diǎn)F,連接DA、DF.設(shè)運(yùn)動(dòng)時(shí)間為t秒.
(1)求∠ABC的度數(shù);
(2)當(dāng)t為何值時(shí),AB∥DF;
(3)設(shè)四邊形AEFD的面積為S.①求S關(guān)于t的函數(shù)關(guān)系式;
②若一拋物線y=-x2+mx經(jīng)過動(dòng)點(diǎn)E,當(dāng)S<2時(shí),求m的取值范圍(寫出答案即可).

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如圖,在平面直角坐標(biāo)系中,點(diǎn)A(,0),B(3,2),C(0,2).動(dòng)點(diǎn)D以每秒1個(gè)單位的速度從點(diǎn)O出發(fā)沿OC向終點(diǎn)C運(yùn)動(dòng),同時(shí)動(dòng)點(diǎn)E以每秒2個(gè)單位的速度從點(diǎn)A出發(fā)沿AB向終點(diǎn)B運(yùn)動(dòng).過點(diǎn)E作EF上AB,交BC于點(diǎn)F,連接DA、DF.設(shè)運(yùn)動(dòng)時(shí)間為t秒.
(1)求∠ABC的度數(shù);
(2)當(dāng)t為何值時(shí),AB∥DF;
(3)設(shè)四邊形AEFD的面積為S.①求S關(guān)于t的函數(shù)關(guān)系式;
②若一拋物線y=-x2+mx經(jīng)過動(dòng)點(diǎn)E,當(dāng)S<2時(shí),求m的取值范圍(寫出答案即可).

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如圖,在平面直角坐標(biāo)系中,點(diǎn)A(,0),B(3,2),C(0,2).動(dòng)點(diǎn)D以每秒1個(gè)單位的速度從點(diǎn)O出發(fā)沿OC向終點(diǎn)C運(yùn)動(dòng),同時(shí)動(dòng)點(diǎn)E以每秒2個(gè)單位的速度從點(diǎn)A出發(fā)沿AB向終點(diǎn)B運(yùn)動(dòng).過點(diǎn)E作EF上AB,交BC于點(diǎn)F,連接DA、DF.設(shè)運(yùn)動(dòng)時(shí)間為t秒.
(1)求∠ABC的度數(shù);
(2)當(dāng)t為何值時(shí),AB∥DF;
(3)設(shè)四邊形AEFD的面積為S.①求S關(guān)于t的函數(shù)關(guān)系式;
②若一拋物線y=-x2+mx經(jīng)過動(dòng)點(diǎn)E,當(dāng)S<2時(shí),求m的取值范圍(寫出答案即可).

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