當(dāng)x為何值時(shí),下面分式有意義:

答案:
解析:

x為任意實(shí)數(shù)


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科目:初中數(shù)學(xué) 來(lái)源: 題型:

如圖,在長(zhǎng)方形ABCD中,AD=BC=16,AB=DC=12,點(diǎn)P和點(diǎn)Q分別是兩個(gè)運(yùn)動(dòng)的點(diǎn).動(dòng)點(diǎn)P從A點(diǎn)出發(fā),沿線段AB,BC向C點(diǎn)運(yùn)動(dòng),速度為每秒2個(gè)單位長(zhǎng)度;動(dòng)點(diǎn)Q從B點(diǎn)出發(fā),沿線段BC向C點(diǎn)運(yùn)動(dòng),速度為每秒1個(gè)單位長(zhǎng)度.P,Q同時(shí)出發(fā),從兩點(diǎn)出發(fā)時(shí)開(kāi)始計(jì)時(shí),設(shè)運(yùn)動(dòng)的時(shí)間是t(秒).
(1)請(qǐng)用含t的代數(shù)式表示下面線段的長(zhǎng)度;
當(dāng)點(diǎn)P在AB上運(yùn)動(dòng)時(shí),AP=
2t
2t
;PB=
12-2t
12-2t
;
當(dāng)點(diǎn)P運(yùn)動(dòng)到BC上時(shí),PB=
2t-12
2t-12
;PC=
28-2t
28-2t

(2)當(dāng)點(diǎn)P在AB上運(yùn)動(dòng)時(shí),t為何值時(shí),線段PB與線段BQ的長(zhǎng)度相等?
(3)當(dāng)t為何值時(shí),動(dòng)點(diǎn)P與動(dòng)點(diǎn)Q在BC邊上重合?

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科目:初中數(shù)學(xué) 來(lái)源:2012-2013學(xué)年湖南省東安一中七年級(jí)上學(xué)期期末測(cè)試數(shù)學(xué)試卷(帶解析) 題型:解答題

如圖,在長(zhǎng)方形ABCD中,AD=BC=16,AB=DC=12,點(diǎn)P和點(diǎn)Q分別是兩個(gè)運(yùn)動(dòng)的點(diǎn).動(dòng)點(diǎn)P從A點(diǎn)出發(fā),沿線段AB,BC向C點(diǎn)運(yùn)動(dòng),速度為每秒2個(gè)單位長(zhǎng)度;動(dòng)點(diǎn)Q從B點(diǎn)出發(fā),沿線段BC向C點(diǎn)運(yùn)動(dòng),速度為每秒1個(gè)單位長(zhǎng)度.P,Q同時(shí)出發(fā),從兩點(diǎn)出發(fā)時(shí)開(kāi)始計(jì)時(shí),設(shè)運(yùn)動(dòng)的時(shí)間是t(秒).

(1)請(qǐng)用含t的代數(shù)式表示下面線段的長(zhǎng)度;
當(dāng)點(diǎn)P在AB上運(yùn)動(dòng)時(shí),AP=_________;PB=_________;
當(dāng)點(diǎn)P運(yùn)動(dòng)到BC上時(shí),PB=_________;PC=_________;
(2)當(dāng)點(diǎn)P在AB上運(yùn)動(dòng)時(shí),t為何值時(shí),線段PB與線段BQ的長(zhǎng)度相等?
(3)當(dāng)t為何值時(shí),動(dòng)點(diǎn)P與動(dòng)點(diǎn)Q在BC邊上重合?

查看答案和解析>>

科目:初中數(shù)學(xué) 來(lái)源:2015屆湖南省七年級(jí)上學(xué)期期末測(cè)試數(shù)學(xué)試卷(解析版) 題型:解答題

如圖,在長(zhǎng)方形ABCD中,AD=BC=16,AB=DC=12,點(diǎn)P和點(diǎn)Q分別是兩個(gè)運(yùn)動(dòng)的點(diǎn).動(dòng)點(diǎn)P從A點(diǎn)出發(fā),沿線段AB,BC向C點(diǎn)運(yùn)動(dòng),速度為每秒2個(gè)單位長(zhǎng)度;動(dòng)點(diǎn)Q從B點(diǎn)出發(fā),沿線段BC向C點(diǎn)運(yùn)動(dòng),速度為每秒1個(gè)單位長(zhǎng)度.P,Q同時(shí)出發(fā),從兩點(diǎn)出發(fā)時(shí)開(kāi)始計(jì)時(shí),設(shè)運(yùn)動(dòng)的時(shí)間是t(秒).

(1)請(qǐng)用含t的代數(shù)式表示下面線段的長(zhǎng)度;

當(dāng)點(diǎn)P在AB上運(yùn)動(dòng)時(shí),AP=_________;PB=_________;

當(dāng)點(diǎn)P運(yùn)動(dòng)到BC上時(shí),PB=_________;PC=_________;

(2)當(dāng)點(diǎn)P在AB上運(yùn)動(dòng)時(shí),t為何值時(shí),線段PB與線段BQ的長(zhǎng)度相等?

(3)當(dāng)t為何值時(shí),動(dòng)點(diǎn)P與動(dòng)點(diǎn)Q在BC邊上重合?

 

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