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1、小升初英文奥数题系列之二小升初英文奥数题系列之二第一期英文奥数推出之后，家长和同学们都反映非常好，说受益匪浅。因此我们推出系列二。但同时也有些问题，很多家长反映孩子觉得比较难。首先希望家长多多辅导孩子，其实奥数知识同学们是都会的，但是有些英文单词不认识，希望家长帮助孩子共同提高。另外，我们只是希望那些比较优秀的同学和学有余力的同学来做，没有必要所有同学都要会做。1、Did you know? In the decimal number system (base 10) ten different digits, 0 to 9, are used to write all the numbers
2、. 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 system (base 8)?A) 128 B) 127 C) 126 D) 125 E) 1242、The number of diagonals that can be drawn in a regular polygon withtwenty sides (cosign)
3、is_.3、If a and b are integers, 10and then 3796 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 consecutivedays is_6、Saul plays a video game in w
4、hich 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 mbehind A and when B finishes C is 20 m behind B. How far in metres was C from A when A finished?(Lets assum
5、e all the athletes run at a constant speed)8、The areas of the faces of a rectangulabox 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 1：9/10：18/258、420 分解质因数9、13 种
