1) 96+12т
2) 4а-60
3) 10у+110
4) 135-9с
Ну, не на все могу ответит, но все же вот:
1) 10 кг
3) а: -18
в: -2
8) уг 2) 135 градусов.
уг 3) 45 градусов.
уг 4) 135 градусов
М- 8л.
От.- ?, в 5 раз больше М.
Л. -? на 25 л. моложе От.
От. = 8*5=40 -Отцу лет
Л. = 40-25=15 - Лизе лет
\![\frac{ctg(270-\alpha)}{1-tg^2(\alpha-180)}*\frac{ctg^2(360-\alpha)-1}{ctg(180+\alpha)}=\frac{tg\alpha}{1-tg^2\alpha}*\frac{ctg^2\alpha-1}{ctg\alpha}=](https://tex.z-dn.net/?f=%5Cfrac%7Bctg%28270-%5Calpha%29%7D%7B1-tg%5E2%28%5Calpha-180%29%7D%2A%5Cfrac%7Bctg%5E2%28360-%5Calpha%29-1%7D%7Bctg%28180%2B%5Calpha%29%7D%3D%5Cfrac%7Btg%5Calpha%7D%7B1-tg%5E2%5Calpha%7D%2A%5Cfrac%7Bctg%5E2%5Calpha-1%7D%7Bctg%5Calpha%7D%3D+)
![=\frac{tg\alpha}{tg\alpha*ctg\alpha-tg^2\alpha}*\frac{ctg^2\alpha-tg\alpha*ctg\alpha}{ctg\alpha}=\frac{tg\alpha}{tg\alpha(ctg\alpha-tg\alpha)}*\frac{ctg\alpha(ctg\alpha-tg\alpha)}{ctg\alpha}=1](https://tex.z-dn.net/?f=%3D%5Cfrac%7Btg%5Calpha%7D%7Btg%5Calpha%2Actg%5Calpha-tg%5E2%5Calpha%7D%2A%5Cfrac%7Bctg%5E2%5Calpha-tg%5Calpha%2Actg%5Calpha%7D%7Bctg%5Calpha%7D%3D%5Cfrac%7Btg%5Calpha%7D%7Btg%5Calpha%28ctg%5Calpha-tg%5Calpha%29%7D%2A%5Cfrac%7Bctg%5Calpha%28ctg%5Calpha-tg%5Calpha%29%7D%7Bctg%5Calpha%7D%3D1)
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