Предмет: Математика, автор: minchukov

Помогите решить номер 902 ( в, г ) даю 15 баллов

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Ответы

Автор ответа: game7
0
в) (7b-6)^2-(12+7b)^2=-18
49b^2-12b+36-49b^2+24b+144=-18
12b+180=-18
12b=-198
b=-198:12
b=-16,5
ОТВЕТ: -16,5
г)(5s+3)^2-17=(6-5s)^2+28
25s^2+6s+9-17=25s^2-10s+36+28
переносим переменные налево, просто числа направо, получится:
25s^2-25s^2+6s+10s=36+28+17-9
16s=72
s=72:16
s=4,5
ОТВЕТ: 4,5
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are
may
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were 
are 
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will 
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has worked 
was working
work 

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is 
have been
was 
has been 

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had been having 
have been had
was having 
had 

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may 
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