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英文奥数 1．maths(English) 1）Find the sum of all the prime numbers Between 20and 30. 2）Divide the sum of the first five odd numbers bythe sum of the first two prime numbers. 3）Subtract 2 from the sum of the first five evennumbers. The difference is then divided by the first odd number following 5. Whatis the quotient?
4）Find the value of[4+8]÷[5×4-6]and givethe answer correct to 2 decimal places 1）All the prime numbers between 20 and 30 are 23 and 29， The sum of all the primenumbers Between 20 and 30 = 23 + 29 = 52 2）The first five odd numbers are 1, 3, 5, 7and 9 The sum of the firstfive odd numbers = 1 + 3 + 5 + 7 + 9= 25
3）Thefirst two prime numbers are 2 and 3
The sum of the first two prime numbers= 2 + 3= 5
4）The first five even numbers are 2, 4, 6, 8 and 10
The sum of the first five evennumbers= 2 + 4 + 6 + 8 + 10= 30
5）The difference between the sum of the first five evennumbers and 2
= 30 - 2= 28
6）The first odd number following 5 is 7
The quotient = 28 / 7= 4
7）The value of [4+8]÷[5×4-6] = 12 ÷ ( 20 - 6 ) = 12 ÷14= 0.86 ( Corr. to 2 decimal places ) 2．Six trees are equally spaced along one side of a straight road. the distance from the first tree to the fourth is 60 feet . what is the distance in feet between. The first and last trees? 3．At the end of 2005 walter was half as old as hasgrandmother.The snm of the years in which they were born is 3860 .how old willwalter be at the end of 2006? 4．The digits1,2,3,4 and 9 are each used once to form the greatest possible even five-digit number. What is the digit in the tens place?
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