oofoofoof1
14.04.2021 •
Mathematics
Which of the following is a solution to the equation x^2 - 7x +5?
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Ответ:
Ответ:
the sum is 1 + 3 + 5 + ... 1999999
= 1 + 2 + ... + 2000000 - 2*(1 + ... + 1000000)
= 2000000*2000001/2 - 2*(1000000*1000001 / 2)
= 1000000*(2000001 - 1000001) = 1000000000000 (one million million)
and dividing this by one million to get the average,
you get one million