1) 36*2/9=8 <span>Ответ: 8 лет
2) </span><span>(5/4)*100=125 процентов
3) </span>20сл- 40\% (100-60=40\%) х сл -100\% <span>х=20*100/40= 50слов- выучила всего</span>
81 I3
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-6 27
21
-21
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0 81:3= 27.
Y = kx + b
1) A ( - 2 ; 5 )
5 = - 2k + b
2) B ( 1 ; - 2 )
- 2 = k + b
3) - 5 = 2k - b
- 2 = k + b
- 5 - 2 = 2k + k - b + b
- 7 = 3k
k = - 7/3 = - 2 1/3
4) - 2 = k + b
- 2 = - 2 1/3 + b
b = - 2 + 2 1/3 = 1/3
Ответ y = - 2 1/3x + 1/3