1. 5,75+27,8=33,55
2.33,55:0,5=67,10
3.0,29+67,1=67,39
4.67,39-3,8=63,59
(1 2/3 - 3/8): 2 2/5=155/2881) 1 2/3 - 3/8=1 7/24
2) 1 7/24 : 2 2/5= 155/288
![\frac{a}{a^{2} -64} +\frac{8}{64-a^{2} }=\frac{a}{(a-8)(a+8)} +\frac{8}{(8-a)(8+a) }=\frac{a}{(a-8)(a+8)} -\frac{8}{(a-8)(a+8) }=\frac{a-8}{(a-8)(a+8)} =\frac{1}{a+8}](https://tex.z-dn.net/?f=%5Cfrac%7Ba%7D%7Ba%5E%7B2%7D%20-64%7D%20%2B%5Cfrac%7B8%7D%7B64-a%5E%7B2%7D%20%7D%3D%5Cfrac%7Ba%7D%7B%28a-8%29%28a%2B8%29%7D%20%2B%5Cfrac%7B8%7D%7B%288-a%29%288%2Ba%29%20%7D%3D%5Cfrac%7Ba%7D%7B%28a-8%29%28a%2B8%29%7D%20-%5Cfrac%7B8%7D%7B%28a-8%29%28a%2B8%29%20%7D%3D%5Cfrac%7Ba-8%7D%7B%28a-8%29%28a%2B8%29%7D%20%3D%5Cfrac%7B1%7D%7Ba%2B8%7D)
Раскладываем знаменатели на множители по формуле разность квадратов, далее приводим к общему знаменателю
1)224*46=10304
2)10304-3232=7072
3)7072:34=208