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Other way factor f^2 multiple times: Step 1: 7^2(7^3 +7^2 + 7+ 1) + 7 Step 2: 7^2(7^2(7 + 1) + 8) + 7 Step 3: 49(49*8 + 8) + 7 Now its clear that content of the bracket reduce to 50 x 8, therefore the final calculation is 49 * ( 400 ) + 1 = 19607
People in the comments section seems to not understand this video, they say they can solve it much faster with a calculator. The things is, this video teach us how to solve a question like this, because a normal person don't know the value of 7⁸ and plus.
Seems like an awful long way to get the answer
This is a question of GP in which a=7,r=7,n=5so Sn=a(r^n-1)
________
r-1
Exactly 💯
S5=7(7^5-1)/(7-1) !!! 😮😁🤣
Other way factor f^2 multiple times:
Step 1: 7^2(7^3 +7^2 + 7+ 1) + 7
Step 2: 7^2(7^2(7 + 1) + 8) + 7
Step 3: 49(49*8 + 8) + 7
Now its clear that content of the bracket reduce to 50 x 8, therefore the final calculation is 49 * ( 400 ) + 1 = 19607
Super
I just type it into Matlab Symbolic. I can get a symbolic or numeric answers without hurting my brain.
Ошибка, когда выводила за скобки 50 , проще было бы 7 возвести в пятнадцатую степень на калькуляторе 😃
There would be a better and easier way...
Faster just to calculate
Lack of basic understanding of tables
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Thank you very much!!!
15
19,607
Тут обычная геометрическая прогрессия. Школьник 6 класса решит.
Гуд
People in the comments section seems to not understand this video, they say they can solve it much faster with a calculator. The things is, this video teach us how to solve a question like this, because a normal person don't know the value of 7⁸ and plus.
7 to the power of 15
Be careful + operant not * between the 7 powers.
No !
111110
Dude
This can be more easier 49 x 50 x 8 = 49 x 50 x 2 x 4 = 49 x 100 x 4 = 196 x 100 = 19600
I been quit
But for the case is not 'watch hours'
😁
Thanks man, same formula here.
19607 по формуле суммы членов геометрической прогрессии.
Super simple
11111(base 7) 😅
111110
Are you crazy?? (7^6-1)/6
Chán quá
У меня получилось намного быстрее - просто я не решал этот бессмысленный пример, неимеющий никакого практического смысла
16807+2401+343+49+7=19607