小升初英语试题-轻巧夺冠 2-人教PEP（网资源）.doc

添加微信：car4900，免费领小学资料 试题二 1. Did you know? In the decimal number system (base 10) ten different digits, 0 to 9, are used to write all the numbers. In the binary number system (base 2) two different digits are used, i.e. 0 and 1. Which one of the following numbers is not a valid number in the octal number system (base 8)?[来源:Z§xx§k.Com] A) 128 B) 127 C) 126 D) 125 E) 124 2. The number of diagonals that can be drawn in a regular polygon with twenty sides (icosagon) is_____. 3. If a and b are integers, 10Ä3=1,152Ä7=3, and then 379Ä6 is equal to_____. 4. Two numbers are in the ratio 2 : 3. When 4 is added to each number the ratio changes to 5 : 7.The sum of the two original numbers is____. 5. The greatest number of Mondays which can occur in 45 consecutive days is____ 6. Saul plays a video game in which he scores 4 for a hit and lost 6 for a miss. After 20 rounds his score is 30. The number of times he has missed is____. 7. Three girls A, B and C run in a 100 m race. When A finishes, B is 10 m behind A and when B finishes C is 20 m behind B. How far in metres was C from A when A finished?(Let’s assume all the athletes run at a constant speed) 8. The areas of the faces of a rectangular box are 84 cm2 , 70 cm2and 30 cm2.The volume of the box in cm3 is____. 9. You have 3 weights: 1 kg, 3 kg and 9 kg as well as an equal arm balance, as shown. How many different weight objects can you weigh with these three? [Remember the weights may be placed on either side][来][来源:学科网] 参考答案： 1. A 考察我们学过的简单的进制问题，显然8进制中没有8出现 2. 170 找规律，公式为n×(n-3)÷2 3. 1 定义新运算，就是求379÷6的余数。 4. 40，16和24 5. 7 6. 5 7. 28米，根据距离比求出速度比，三者的速度比为1：9/10：18/25[来源:学&科&网] 8. 420 分解质因数[来Com] 9. 13种 添加微信：car4900，免费领小学资料