A Nice Math Problem

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[@dang4546]

Nice job! Very clear.

[@user-gb4ic9lw5w]

2^3+…+5^3 = 1^3+…+5^3-1^3 = 15^2-1 = 14*16. I don’t like addition XD

[@pejuangringgit-vn5ux]

Nice sir. . 👍👍👍👍

[@learncommunolizer]

Thanks and welcome 👍👍👍👍

[@kobalt4083]

First, take 7^3 out on the numerator and rewrite the bottom numbers as a product of 7 to get 7^3(8+27+64+125)/(7*2*7*3*7*4*7*5). Since we are multiplying 7 4 times, we can easily write it as an exponent to cancel it off with the numerator. Also, the sum 8+27+64+125 is equal to 224. So we have 7^3(224)/7^4(2*3*4*5)=224/7*2*3*4*5. 224 and 7 are both divisible by 7(divide both the numerator and denominator by 7). 32/(2*3*4*5). Divide both the num. and den. by 8 -> 4/3*5=4/15. So the answer is 4/15.

[@pawelpap9]

I solved it without a pen and paper. Just looking at it.

[@amitavadasgupta6985]

=224/7×6×20=32/6×20=4/15ans

[@MartinPerez-oz1nk]

THANKS PROFESOR!!!!!, VERY INTERESTING!!!!!

[@learncommunolizer]

You are welcome!

[@frosinabrahja1792]

2

[@jonathanr520]

I GOT IT!!! (I put 8/30 but same thing...) LET'S GO!!! 😎✋️

[@ruslanzinnatullin2246]

221/840 or 4/15

[@user-ty4ro7fz6f]

Очень долго

[@user-ux8mh1qe9s]

In my opinion, 3 is not a big degree, you can calculate everything in 5 minutes without any transformations.

[@leaphengtry639]

It will take you too long to solve that and sometimes it confuses you because of too much number

[@leaphengtry639]

Do as he does is safer.

[@unbelievable1303]

math is the most beautiful science, you shouldn’t spoil it by calc, ofc if you have only 3 minutes to solve it, you can use calculator. Just try to understand, that you are improving your mind, when you trying to find a simple solution.😋

[@halimaezrh4702]

Très long .

[@geethaenturi9045]

224/840

[@robertveith6383]

That is not in lowest terms.

[@ajitsinghbehl4046]

Poor in mathematics. Person solving the problem has have no knowledge of basics of mathematics.

[@kobalt4083]

What's wrong with how he did it? Explain please.

[@sergejmaksimov3876]

Not correct

[@RamakrishnaYellepeddi]

Why?

[@jonathanr520]

? 😮

[@wavingbuddy3535]

yes it is correct

[@maxarturogarcialopez8808]

5 Σ (i)³ para n = 5 i=2 ( n(n +1)/2)² - 1 ______ = __________________ = 4/15 7X5! 7 X 5!