: 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 AB * height_A * 1/2 = AC * height_B * 1/2 (the triangle area is the same) 3 * height_A * 1/2 = 6 * height_B *1/2 height_A = 2 * height_B => height_A > height_B # : 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 题目是问说一个在没有任何折扣之前16元的玩具在折扣之後可能的最低价钱 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 x=-900 => 4bits * 3digits + 1bits * 1sign = 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 : 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 因为要递降的四位数，所以最大的数字是9876，最小的数字是3210 9876 - 3210 = 6666 # --

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