![\frac{a-5}{6-3a} + \frac{4(a+1)}{a^{2}+4a} : (\frac{9a}{a^{2}-16} - \frac{a+4}{a^{2}-4a}) = \frac{a-5}{6-3a} + \frac{4(a+1)}{a^{2}+4a} : (\frac{9a}{(a-4)(a+4)} - \frac{a+4}{a(a-4)}) = \frac{a-5}{6-3a} + \frac{4(a+1)}{a^{2}+4a} : (\frac{9a*a -(a+4)^2}{a(a-4)(a+4)}) = \frac{a-5}{6-3a} + \frac{4(a+1)}{a^{2}+4a} : (\frac{9a^2 -a^2-8a-16}{a(a-4)(a+4)}) = \frac{a-5}{6-3a} + \frac{4(a+1)}{a^{2}+4a} : (\frac{8a^2-8a-16}{a(a-4)(a+4)}) =](https://tex.z-dn.net/?f=+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29%7D%7Ba%5E%7B2%7D%2B4a%7D+%3A+%28%5Cfrac%7B9a%7D%7Ba%5E%7B2%7D-16%7D+-+%5Cfrac%7Ba%2B4%7D%7Ba%5E%7B2%7D-4a%7D%29+%3D+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29%7D%7Ba%5E%7B2%7D%2B4a%7D+%3A+%28%5Cfrac%7B9a%7D%7B%28a-4%29%28a%2B4%29%7D+-+%5Cfrac%7Ba%2B4%7D%7Ba%28a-4%29%7D%29+%3D+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29%7D%7Ba%5E%7B2%7D%2B4a%7D+%3A+%28%5Cfrac%7B9a%2Aa+-%28a%2B4%29%5E2%7D%7Ba%28a-4%29%28a%2B4%29%7D%29+%3D+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29%7D%7Ba%5E%7B2%7D%2B4a%7D+%3A+%28%5Cfrac%7B9a%5E2+-a%5E2-8a-16%7D%7Ba%28a-4%29%28a%2B4%29%7D%29+%3D+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29%7D%7Ba%5E%7B2%7D%2B4a%7D+%3A+%28%5Cfrac%7B8a%5E2-8a-16%7D%7Ba%28a-4%29%28a%2B4%29%7D%29+%3D+)
![\frac{a-5}{6-3a} + \frac{4(a+1)}{a^{2}+4a} :\frac{8(a^2-a-2)}{a(a-4)(a+4)} = \frac{a-5}{6-3a} + \frac{4(a+1)}{a^{2}+4a} : \frac{8(a-2)(a+1)}{a(a-4)(a+4)} = \frac{a-5}{6-3a} + \frac{4(a+1)}{a(a+4)} * \frac{a(a-4)(a+4)}{8(a-2)(a+1)}= \frac{a-5}{6-3a} + \frac{4(a+1)a(a-4)(a+4)}{a(a+4) *8(a-2)(a+1)}=](https://tex.z-dn.net/?f=+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29%7D%7Ba%5E%7B2%7D%2B4a%7D+%3A%5Cfrac%7B8%28a%5E2-a-2%29%7D%7Ba%28a-4%29%28a%2B4%29%7D+%3D+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29%7D%7Ba%5E%7B2%7D%2B4a%7D+%3A+%5Cfrac%7B8%28a-2%29%28a%2B1%29%7D%7Ba%28a-4%29%28a%2B4%29%7D+%3D+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29%7D%7Ba%28a%2B4%29%7D+%2A+%5Cfrac%7Ba%28a-4%29%28a%2B4%29%7D%7B8%28a-2%29%28a%2B1%29%7D%3D+%5Cfrac%7Ba-5%7D%7B6-3a%7D+%2B+%5Cfrac%7B4%28a%2B1%29a%28a-4%29%28a%2B4%29%7D%7Ba%28a%2B4%29+%2A8%28a-2%29%28a%2B1%29%7D%3D+)
![\frac{a-5}{3(2-a)}+\frac{(a-4)}{2(a-2)}= \frac{a-5}{3(2-a)} -\frac{(a-4)}{2(2-a)} = \frac{2(a-5) - 3(a-4)}{6(2-a)} = \frac{2a-10 - 3a+12}{6(2-a)}= \frac{- a+2}{6(2-a)} =\frac {1}{6}](https://tex.z-dn.net/?f=+%5Cfrac%7Ba-5%7D%7B3%282-a%29%7D%2B%5Cfrac%7B%28a-4%29%7D%7B2%28a-2%29%7D%3D+%5Cfrac%7Ba-5%7D%7B3%282-a%29%7D+-%5Cfrac%7B%28a-4%29%7D%7B2%282-a%29%7D+%3D+%5Cfrac%7B2%28a-5%29+-+3%28a-4%29%7D%7B6%282-a%29%7D+%3D+%5Cfrac%7B2a-10+-+3a%2B12%7D%7B6%282-a%29%7D%3D+%5Cfrac%7B-+a%2B2%7D%7B6%282-a%29%7D+%3D%5Cfrac+%7B1%7D%7B6%7D)
значит искомое число равно 1/6*4=4/6=2/3
ответ: 2/3
Потому что мы сравниваем числа поразрядно: в разряде десятых везде стоит пятёрка, а вот в разряде сотых уже разные цифры, поэтому чем больше цифра в разряде сотых, тем больше само число: 0.538, 0.55, 0.58.
Р =(а +в ) х2
( 22 -5,03 х 2) : 2 =5,97( м) ширина прямоугольника
Р = а х 4
5, 97 х 4 = 23, 88(м) периметр квадрата
А заданий нет я не смогу тебе помочь