momoney9957
01.09.2019 •
Mathematics
Fiffteen min. after seven what time is it
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Ответ:
Ответ:
Ответ:
x=40,20
Step-by-step explanation:
800=60x - x^2
800-60x + x^2 = 0
(x - 40)(x-20)=0
So x=40,20