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佢叫你搵頭5個自然數的和...
1+2+3+4+5
=5*3(5*6/2)(有3組5)
=15
所以1+2+3+...+99+100都計到
=101*50(50組101)
=5050

2010-09-08 18:15:01 補充：
even number 係解雙數(偶數)odd number係解單數(奇數)
difference係差
18-12=6
Form 1數???

1)Find the sum of the first 5 natural numbers
即係叫你搵個答案(for+數)係由首5個自然數 (1+2+3+4+5=15)



2)Find the difference between the largest and the smallest even number between 11 and 19
搵係11至19之間最大既偶數同最細既偶數既差(18--12=6)

Find the sum of the first 5 natural numbers
查找總結了前5個自然數
Find the difference between the largest and the smallest even number between 11 and 19
尋找差異最大和最小的偶數 11和19之間

Find the sum of the first 5 natural numbers
找出首5個自然數的總和.
首5個自然數有:1,2,3,4,5
總和:1+2+3+4+5=15

Find the difference between the largest and the smallest even number between 11 and 19
在11至19中,找出最大和最小的雙數,並找出這2個數的差(即相減)
最大的雙數:18
最小的雙數:12
2個數的差:18-12=6

First 5 natural numbers are 1, 2, 3, 4, 5

The sum is 15


The largest even number between 11 and 19 is 18.

The smallest number between 11 and 19 is 12

The difference is 18-12 = 6