Those who have completed the first year of junior high

The original poster: Great warrior Views: 238 Replies: 18 Posted in: 2012-08-30 11:21:20

Great warrior

A simple question to test you: Sum: 1^2 + 2^2 + ... + n^2 (the ^2 is read as "squared" or "to the power of two")

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positive sequence reverse order

Great warrior 2floor

Whether it's a mule or a horse, let it pull and see!

Zhang Qiling 3floor

12 22 32 ......... n2=n(n 1)(2n 1)/6

Rogue Master@King of Power 4floor

Decisive, never! Wahahahahaha

Zhang Qiling 5floor

I'm good at liberal arts, but not good at math calculations. I'm not sure if that's correct.

Great warrior 6floor

Are you ignoring the plus sign on the second floor?

Zhang Qiling 7floor

I can't type the plus sign.

Great warrior 8floor

This question was from a test I took back in the day, and it tripped up a lot of people. Fortunately, I got it right.

Bee Qin Force 9floor

Go back to the first floor, it's a horse, then pinch, I don't know, if it's a math problem, my math score is 3 points, thank you.

Zhang Qiling 10floor

12 22 32 ...... n2 = n(n 1)(2n 1)/6, press again

Great warrior 11floor

Second-floor expert, correct!

Great warrior 12floor

Second-floor expert, correct if you don't look at the plus sign!

Great Sage, Equal of Heaven 13floor

n*(n + 1)*(2n + 1)/6

Great Sage, Equal of Heaven 14floor

This seems to be the sum of a geometric series in the first year of high school.

Great warrior 15floor

I solved this problem in the first year of junior high (thirty minutes, without any formulas)

Great warrior 16floor

I'm still floating in the third year of middle school.

Zhang Qiling 17floor

The only difficult point in ninth-grade math is quadratic functions.

Great warrior 18floor

The function is too simple

Jade Shattered @ Tian Chi 19floor

This is a sequence, I remember it was in my math book, something about the sum of cubes or so. Look at my brain, I've completely forgotten it.

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