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(2)連結(jié)AC、BC.因為BC的長度一定，所以△PBC周長最小，就是使PCPB?最小.B點關(guān)于對稱軸的對稱點是A點，AC與對稱軸x=1的交點即為所求的點P.
2019-07-23
鞍不離馬背，甲不離將 〖解釋〗甲：鎧甲。馬不卸鞍，人不解甲。處于高度警惕狀態(tài)。 鞍馬勞神 見 鞍馬勞頓 。 鞍前馬后 馬前馬后。指追隨左右。 鞍馬之勞 鞍馬：鞍子和馬，指長途跋涉或打仗。形容旅途或戰(zhàn)斗的勞苦。
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81.晏殊《浣溪沙》詞上片 一曲新詞酒一杯，去年天氣舊亭臺 ，兩句構(gòu)成 新 與 舊 的對 比，下片構(gòu)成 來 與 去 對比的詞句是：______________________，______________________。 82.白居易的《賣炭翁》中 可憐身上
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例題一：假設(shè)你叫劉京，是美國中學(xué)生托尼的筆友，你收到了他的來信。請給托尼寫一封回信，回答他的問題，介紹北京良好的公交服務(wù)，并談?wù)勀愕母惺堋?Hi! Liu Jing, My grandpa is going to Beijing next month beca
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Policemen were called by a shop in Southland early on Christmas morning. When they 1 they found two burglars (偷盜者) were kept in a lift with a heavy box of money. The two men were in their twenties
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中國古代著名詩人及風(fēng)格(格式：作家 人生經(jīng)歷 思想內(nèi)容 藝術(shù)特點) (1)王維 身陷叛軍，皈依佛門 前期積極，后期求禪 詩中有畫，畫中有詩 人生經(jīng)歷：(公元701 761)，字摩詰，唐代山水田園詩人，原籍太原祁縣(今屬山西
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2019-07-23
The water and the land are thought part of the earth surface (表面). The air is 1 thought a kind of blanket (毯子) 2 the earth. But it is 3 than that. Maybe you have been in a cave (洞穴) 4 in the ea
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如圖，拋物線 經(jīng)過A(-1，0)、C(0，4)兩點，與x軸交于另一點B. (1)求拋物線的解析式; (2)已知點D(m，m 1)在第一象限的拋物線上，求點D關(guān)于直線BC對稱的點的坐標; (3)在(2)的條件下，連接BD，點P為拋物線上一點，且 D
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如圖，拋物線與x軸交于A，B兩點，與y軸交于C點，且經(jīng)過點(2，3a)，對稱軸是直線x=1，頂點是M. (1)求拋物線對應(yīng)的函數(shù)表達式; (2)經(jīng)過C,M兩點作直線與x軸交于點N，在拋物線上是否存在這樣的點P，使以點P,A,C,N為頂點
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已知拋物線 (a=?0)經(jīng)過點A(-2，0)，拋物線的頂點為D，過O作射線OM||AD .過頂點 D平行于x軸的直線交射線 OM于點C ，B在x 軸正半軸上，連結(jié)BC . (1)求該拋物線的解析式; (2)若動點P從點O出發(fā)，以每秒1個長度單位的速
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#p#分頁標題#e#
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Debbie got up early last Saturday morning. She wanted 1 in Green Park with some of her friends. She was very 2 about it. 3 she was ready, she got on her bike and 4 for the park -- it was on the other
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It s over! Thank goodness! school was 1 and I was tired. I 2 at the front of the school bus. Janie, the driver, tries to 3 the uncomfortable atmosphere by striking the match of talks. I try to list
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21.陸游的《游山西村》中寓含哲理，廣為流傳的兩句詩是：_______________________，_______________________。 22.《次北固山下》一詩中，表現(xiàn)時序變遷、新舊交替這一自然規(guī)律的詩句是：_______________________，_
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2019-07-23
Why do people play football? It s a(n) 1 game and it s dangerous too. Twenty-two men fight 2 ninety minutes to make 3 many goals as they can. They get 4 black eyes, bruise (擦傷) and broken bones tha
2019-07-23
During the war, an English pilot (飛行員) was hurt. But he was 1 by a group of nuns (修女). He had been very 2 and lost his sense. When he came to himself he was 3 to find a woman beside him. It was
2019-07-23
要把一到 的英語單詞復(fù)習(xí)一遍，把各單元的短語，語法總結(jié)歸納一下，重點課文要熟讀，要背的背一背;找本語法書把初中學(xué)過語法過一遍，練聽力，做習(xí)題。 對 時間 考察很多 聽力似乎成了很多考生拿高分的攔路虎。建議
2019-07-23
每個學(xué)生，就都想成為優(yōu)秀學(xué)生，肯定不會甘愿當一個 差生 。但是，在不知不覺中，你就被定格在 差生 的行列而不能自拔。以化學(xué)學(xué)科為例子，某一天，你突然感到：化學(xué)竟然這么難?!我聽不懂! 其實，不是化學(xué)太難，而
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3l.大自然美麗的湖光山色滌蕩了我們的心胸，讓我們心清如水;愉悅了目鳥的性情，使它們在山林間盡情歌唱。這真是_______________________，_______________________。(填寫常建《題破山寺后禪院》的詩句) 32. 李商隱
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Soon after Dave left university, one of his uncles, who was 1 and had no children of his own, died and 2 Dave a lot of money, so he decided to 3 his own company. He found a nice 4 , 5 some new furnit
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已知二次函數(shù) 。 (1)求證：不論a為何實數(shù)，此函數(shù)圖象與x軸總有兩個交點。 (2)設(shè)a
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A thousand years ago, Hong Kong was covered by a thick forest. As more and more people came to 1 in Hong Kong, these trees were cut down and burnt. Now there is 2 forest left, though there are still
2019-07-23
Overhead bridges can be seen in many parts of Singapore, in the place where traffic is very heavy and crossing the road is 1 . These bridges can make people 2 roads safely. Overhead bridges are used
2019-07-23
如圖，已知拋物線 經(jīng)過A(1，0)，B(0，2)兩點，頂點為D. (1)求拋物線的解析式; (2)將△OAB繞點A順時針旋轉(zhuǎn)90 后，點B落到點C的位置，將拋物線沿y軸平移后經(jīng)過點C，求平移后所得圖象的函數(shù)關(guān)系式; (3)設(shè)(2)中平移后，
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已知平行于x軸的直線 與函數(shù)y=x和函數(shù)y=1/x的圖像分別交于點A和點B，又有定點P(2，0) . (1)若a
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如圖，過△ABC的三個頂點分別作出與水平線垂直的三條直線，外側(cè)兩條直線之間的距離叫△ABC的 水平寬 (a)，中間的這條直線在△ABC內(nèi)部線段的長度叫△ABC的 鉛垂高(h) .我們可得出一種計算三角形面積的新方法： ，即
2019-07-23
When it was over 20 years ago, I first met Mr. Andrews, my old headmaster. During the war (戰(zhàn)爭) I was studying at school in the north of England. My 1 had just returned to London, and there were not
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Granny Sarya lived outside Moscow. Her only son 1 to Afghanistan(阿富汗) and was killed in action there.Soon after that, her husband lost his job. The old man was always 2 food and clothes.And on a w
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