How to calculate the value of 2 4 6 98 100 with a regular rule

One-to-one pairs add and then divide by 2, upstairs ignores this step.

Use the preceding plus the following values. 2+100=4+98=6+96=8+94=...48 + 54 = 50 + 52 = 102, a total of 25 102, so wait one 25 * 102 = 2550

Rule: Two numbers are 2 apart, add the last one to the first.

The penultimate and the second are added together.

By analogy, you will find that everything adds up to 102

Since there are 100 2 numbers in total, so the number added up in this way is 50 2 = 25.

So 25*102=2550

Sequence. Equal difference formula: (first term + tail item) * number of items 2

Above: (2+100)*50 2=2550

The top is wrong, you think about 1 to add 100 to 5050 (it seems to be Gauss said, very classic), will this question have 5100?

Minimum number + maximum number) number 2

For example: (2+100) 50 2=2550

The sum of the series of equal differences is considered as the sum of the two columns and divided by 2

The third sister's beautiful wardrobe.

It's easy. Add the last one to the first.

The penultimate and the second are added together.

Analogy. You'll find that all add up to 102

A total of 100 numbers.

So multiplying 102 by 50 equals 5100....

The nuclear auction pattern of this group of numbers is that the difference between the two adjacent numbers is gradually increasing

Therefore, the next number should be 98 + 64 = 162.

It can be calculated as 199+1=200 198+2=200 197+3=200Until 101 + 99 = 200, a total of 99 times were counted in this way, and the last 200 of the last 200 was 100 times. This cherry blossom 100 times and the trace of the song is 20,000, but there is a 100 in the middle that is not added, so adding 100 answers is 20100

101-49=52 (49 is in addition to 1,100, there are 98 left, two troubles and a group, a total of 98 2=49 groups of liquid staring) Chongchun.

Summary. According to the rule of +96, what is the 10th equation?

Pro, according to the law, the tenth is 11 + 90 = 101

How many times do you need to saw a piece of bamboo into 7 sections? If it takes 2 minutes to saw once, it takes a total of several points to saw.

How many times do you need to saw a piece of bamboo into 7 sections? 7-1 = 6 times, if it takes 2 points to saw once, it takes a total of a few points to see 6 2 = 12 points.

Exploit. 2 (1 3) = 1-1 3, 2 (3 5) = 1 3-1 5...2/（99×101）=1/99-1/101

The final simplified equation can be derived as.

1-1/3+1/3-1/5+1/5-1/7+.+1 97-1 Empty 99+1 99-1 101