英语数学题要有解题方法！1.The sum of n different natural numbers is less

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英语数学题
要有解题方法！
1.The sum of n different natural numbers is less than50.the greatest possible value of n is----
2.Let a be the average of all odd prime numbers less than 50.The inreger,most close to a is----
3.If two even natural numbers x,y satisfy equation x的平方加100等于y的平方,x大于y then x乘y等于----

1. Since there are some controversies, I suppose 0 does not belong to natural numbers in this case. The answer is quite straight foward, 1+2+3+4+5+6+7+8+9=45. If we add 10, then the sum will exceed 50. So the greatest possible n is 9.
2. First of all, you can list all the odd prime numbers less than 50:3 5 7 11 13 17 19 23 29 31 37 41 43 47. Add them up, and calculate the average. The average a is equal to 23.3. Therefore the integer, most close to a is 23.
3. x^2+100=y^2,then (y-x)(x+y)=100, since x and y are natural numbers, x+y>0, y should be larger than x. I am afraid there is either something wrong with the problem or a typing mistake.
You can show me the original version of the problem 3.

英语数学题要有解题方法！1.The sum of n different natural numbers is less 解一道有英语的奥数题：The sum of n different positive integers is less why后面接下the sum of n diffrernt natural number is less than 50 7、The sum of n different positive integers is less than 50.T 英语翻译The sum of n different positive integers is less than 50 if the sum of the three continuous natural numbers is 99,the 5 continuous natural numbers make a sum of 300.what is the l The sum or n different postitive integers is less than 50.Th what is the sum of the first five prime numbers 英语翻译1.The sum of two numbers is 23.If the greater number is 英语意思：numbers in which the sum of its digits is a perfect squ The sum of two even numbers is always what?