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tina7659
23.06.2019 •
Mathematics
The product of three consecutive numbers is 990. what is the sum you f the 3 whole numbers?
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Ответ:
20
Step-by-step explanation:
If the three numbers are x, x+1, and x+2, then:
x (x+1) (x+2) = 990
x (x² + 3x + 2) = 990
x³ + 3x² + 2x - 990 = 0
(x - 9) (x² + 12x + 110) = 0
Since x must be a whole number, x = 9. You can also use simple trial and error to find that the three numbers are 9, 10, 11.
The sum is:
9 + 10 + 11 = 20
Ответ:
144 round balloons and 108 long balloons
Step-by-step explanation:
6 times 24 = 144
3 times 36 = 108