問題詳情
3.下列是用配方法解4:x2+5x-3=0的過程:
第一步: 
第二步: 
第三步: 
第四步: 
。找出哪一步開始發生錯誤?
(A)第二步
(B)第三步
(C)第四步
(D)以上皆正確。
參考答案
無參考答案
內容推薦
- 外星人(A)ailen (B)alien (C)aline
- 歡業KTV推出四種平日優患歡唱方案:星期一:兩人同行,一人半價星期二:四人同行,一人免費星期三:六人以上同行,前六人原價,第七人開始,每人只收一成費用星期四:不管幾人同行,一律六五折中中與朋友共
- 有兩支等高但不等粗的香,第一支香5小時可燒完；第二支香4小時可烧完,若同時點燃且以一定的速率燃燒,則在燃燒幾個小時後,第一支香的高度會等於第二支香高度的3倍?(A) (B) (C) (D)
- 兩相似多邊形對應邊長的比為5:9,面積的和為212平方公分,雨多邊形的面積分別為多少平方公分?(A) 182 (B) 172(C) 162 (D)102
- 附圖為兩正方形ABCD、BEFG 和矩形DGHI的位置圖,其中G、F兩點分別在 上若 ，則△GFH的面積為何? (A)10(B) 11(C) (D)
- 判斷下列各式有幾個為一元一次方程式? (A)3個 (B)4個 (C)5個 (D)6個
- 有大、小兩數，小數比大數的 倍多5,且兩數的和是15。設小數為x，則依題意可列出下列哪一個一元一次方程式?(A) (B) (C) (D)
- x=-2是下列哪一個方程式的解?(A) 3x+2=1 (B) 2-x=x (C) x+3=2x-5 (D) 4x-3=2x-7
- 如圖,已知 =16,C、D、E 三點 四等分分别以 A、B為圆心, 為半徑畫弧,若雨弧交於点,連接 、,求CF=? (A) 8 (B) 6 (C). 4 (D) 2
- 華華的數學考卷中,有3張都得到x分,剩下一張是8分。請問華華這4張數學考卷的平均分數是幾分?(A) 3x+80 (B) x+80 (C) (D)
內容推薦
- 若一元二次方程式x2-7x-a=0中的a為下列何數時,可使此方程式的兩根皆為整數?(A)10(B) 14 (C)16 (D) 18
- 6解一元二次方程式(2x-5)(3x-5)=(2x-5)(5x-2),關於此方程式的根,下列哪一選項是正確的?(A)有一根在2與3之間(B)有一根在0與1之間(C)有一根在1與2之間(D)沒有大於0的
- 在一長為(3x+8)、寬為(3x+5)的長方形右下角剪下一長為寬為3的小長方形，如圖灰色面積所示。利用此圖因式分解(3x+8)(3x+5)-6x3,則可得下列何式? (A)(3x+8)(3x+
- 已知802=6812=6822=6724,則一元二次方程式 x2-8x-6545=0的兩根為何?(A)86或-78(B)78或-86 (C)85或-77 (D) 77或-85。
- 下列一元二次方程式的敘述,何者正確?(A) -2x2-x+1=0有相異兩根。 (B)x2+x+1=0有重根。(C) x2-x-1=0無解。 (D)x2+2x+3=0有相異兩根
- 已知x2+px+q=(x-m)(x-n)若p＞0，q＜0且|m|>|n|,下列敘述何者正確?(A)m>0，n＞0(B)m＞0，n＜0 (C)m＜0，n＞0(D)m<0,n<
- 有大小相同的球若干個,全部的球可以擺成一個正方形,全部的球也可以擺成一個正三角形,兩種擺法如圖。若擺成正三角形,每邊球的個數比擺成正方形時每邊球的個數多2個,則球共有多少個? (A)81 (B
- 如圖是小翰參加「超級金頭腦」遊戲初選的比賽過程,若猜出密碼即可取得進棚挑戰的資格，則根據如圖可知密碼為何? (A)7(B)9(C)11 (D)12。
- 下列 AstraZeneca 之 COVID-19 疫苗的敘述何者最不正確？(A)含有 SARS-CoV-2 病毒棘蛋白(S protein)之非複製型腺病毒載體之疫苗(B)2 ~8°C 冷藏儲存
- While the instructor claimed his comments were __________ to a mild warning, his studentsrecogniz
- Even though he was only a neophyte in the business, he effectively used ________ methods to______
- The irate customer became ________, and then he __________ against the mechanic’s unfairpractices
- Making a(n) ______ visit to his ________, the unknown thief sought reassurance that no one haddis
- Almost lulled to sleep by the candidate’s ___________ speech, the audience seemed to fall into as
- In a child’s early years, he is ____________, accepting instruction and quickly learning new skil
- Since the terms of the proposed agreement between the vendors were __________, bothbusinessmen we
- During the fearful storm, the people in its path __________ God for divine _________.(A) importun
- Most people have _______. They are afraid of snakes.(A) arachnophobia (B) acrophobia (C) ophidio
- Philosophers tell us that one’s lifetime is __________ when considered from the viewpoint of____
- A refugee may be forced to __________ allegiance to his former country and ___________ all ofhis
- My friend’s uncle is a member of Alcoholics Anonymous； his ___________ led to an____________ liv
- ___________ markets sell grains, other foods, and precious metals.(A) Currency (B) Bond (C) Comp
- To change from a passive acceptance of fate to a dynamic involvement in public affairs requires
- Because of his __________ record of lying to police, the suspect was regarded as a(n) _________c
- 【題組】While playing in the park one morning, a loud argument was gotten into by several of the chi