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數學 國中

請問20、22、27、28題的解法?感恩🥹

金鹿 A & C D& B 20. 直角三角形A、B、C中,c為斜邊長,a、b為兩股長,a、b、c均為正整數,則 下列敘述何者正確? (A)a²是(c-b)的倍數 (B)(a+b)是c的倍數 b (C)c²是(a+b)的倍數 (D)(a+c)是b的倍數 力 舟 22. 在甲、乙兩個筒內各放入3個球,並將球分別標上1、2、3與2、3、4。假設兩 筒中每個球被取出的機會均等。若小明自甲筒取出一球,小華自乙筒取出一球,則 小明取出的球其號碼小於小華的機率是多少? (A)(B), (C); (D); -8x+4+9x+6 -4(2x-1)+3(3x+2) x+10 12 12 23. 化簡−2> 2x-13x+2 + = ? 3 4 (A)x+2 (B)x+10 (C) x+2 x+10 (D) 12 12 24. 正整數甲、乙、丙、丁為連續4個3的倍數,例如:3、6、9、12為連續4個3 的倍數,已知甲數最小、乙數為x,則甲+乙+丙+丁之總和為多少? (A) 4x (B) 4x + 6 (C) 4x + 12 (D) 13 - x 4x+6 25. 2x+my = 4. 若二元一次聯立方程式{ x = 2y 則zzz值不可能為下列哪一個數? 的解為x=a、y=b,其中a、b均為正數. 4y+my=4 (A)3 (B) 0 (C) - 2 (D) - 5 (4+m)y=4 26. 請觀察下列的解題過程,找出從哪一個步驟開始發生錯誤? x12 _4x+64≤3x 5-2-(x-1)≤2 (甲) 60-4(x-1)≤3x (乙) 60−4x+4≤3x, (丙) -4x-3x≥64 . ⇒ -7x ≥ 64 . (J) x≤67 64 。 7 (A)甲 (B)乙(C)丙 (D) 丁 36 27.慧喬投擲一顆均勻的骰子兩次,一次出現偶數點,另一次出現3的倍數的機率為 何? BA (A) 2 (B) ¼ 5 (D) 11 √ 36 28. 若方程式x²+2x-11=0,則(x+1)2之值為何? (A) 10 (B) 12 (C) - 10 (D) - 12 410 下列何者錯誤?

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數學 國中

求解🙏

in this town. man 500 e theme jobs change 口 (28~30) Dear Bacon, When we first met on the street, you were small and sweet. Every weekend, we jogged together in the morning. We also played baseball in the park. I threw the ball and you caught it. At night, you sat beside me when I did my homework. Before I went to bed, you always gave me a good night kiss. I felt lucky to have you with me. However, a year later, everything changed. You have grown too big and become very strong. Jogging with you is dangerous. You often dash and pull me into the trees. When we play in the park, you always bite other kids and dogs. At night, you bark a lot. Also, at home, you break every piece of glass and scratch the sofa. You're tearing the house apart. Tomorrow I mus take you to Dr. Jones. I know he looks serious, but my parents and I believe he will turn you into a good dog. So have sweet dreams tonight. Love you, Jimmy dash bark scratch B 28. Where did Jimmy first meet Bacon? (A) In a shop. (B) On a street. (C) In a park. (D) At Jimmy's school. 29. Which is true about Dr. Jones' job? (A) Training dogs to be better. (B) Teaching parents to play with kids. (C) Helping dogs to dream and sleep well. (D) Teaching people to play baseball with others. 30. What can we learn from this letter? (0) (A) Jimmy bought Bacon from Dr. Jones. (B) Jimmy went jogging with Bacon only on Mondays. (C) Jimmy broke all the windows of his house. (D) Bacon barks a lot at night. buy blago tear... apart T'hob 10.1

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