1、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 theoctal number
2、 system (base 8)?来源:Zxxk.ComA) 128 B) 127 C) 126 D) 125 E) 1242. The number of diagonals that can be drawn in a regular polygon withtwenty sides (icosagon) is_.3. If a and b are integers, 103=1,1527=3, and then 3796 is equal to_.4. Two numbers are in the ratio 2 : 3. When 4 is added to each number t
3、he ratio changes to 5 : 7.The sum of the two original numbers is_.5. The greatest number of Mondays which can occur in 45 consecutivedays 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. Thre
4、e girls A, B and C run in a 100 m race. When A finishes, B is 10 mbehind A and when B finishes C is 20 m behind B. How far in metres was C from A when A finished?(Lets 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 vol
5、ume 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)23. 1 定义新运算，就是求3796的余数。4. 40，16和245. 76. 57. 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Com9. 13种添加微信：car4900，免费领小学资料
