※ 引述《kokoyaha (加油加油!!!)》之铭言： : 1. in 三角形ABC, AB=3, BC=4, and AC=6. : The length of The length of : the altitude to the altitude to : base AB base AC : answer:A 三角形面积不管从哪边算都一样 所以 AB * altitude(AB) = AC * altitude(AC) ^^ = 3 ^^ = 6 => altitude(AB) = 2 * altitude(AC) : 2. a toy store regularly sells all stock at a discount of 20 percent : to 40 percent. If an additional 25 percent were deducted from the : discount price during a special sale, what would be the lowest possible : price of a toy costing $16 before any discount? : A. $5.60 : B. $7.20 : C. $8.80 : D. $9.60 : E. $15.20 : answer:B 最低价 = 16 * 0.6 * 0.75 = 7.2 : 3.How many bits of computer memory will be required to store the integer x, : where x=-900(题目是写负的根号810,000 可是我不会打"根号" ^^""), if each digit : requires 4 bits of memory and the sign of x requires 1 bit? : A. 25 : B. 24 : C. 17 : D. 13 : E. 12 : answer: D "each digit" -900 总共3种 digit ....要12 然後题目说x要1 12+1=13 : 4. How many positive integers less than 20 are either a multiple of 2, : an odd multiple of 9, or the sum of a positive multiple of 2 and positive : multiple of 9? : A. 19 : B. 18 : C. 17 : D. 16 : E. 15 : answer:E 2的倍数有9个 9 9倍数的奇数有1个,就是9 1 第三种是9+2 9+4 9+6 9+8 9+10 5 ===================================== total ~ 15 : 5. 9863 : The figure above shows an example of a 4-digit customer identification code. : If the digits in the code must appear in descending numerical order and no : digit can be used more than once, what is the difference between largest and : smallest possible codes? : A. 6,666 : B. 5,555 : C. 5,432 : D. 4,444 : E. 1,111 : answer:A 这题看不到图片 QQ -- --

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