5425452сппапа5634236264261мпмм
<span><span>Противоположное числам:</span>
5/7=-5/7
-30=30</span>
110+80-150=40 учеников
2) сп-ск+3п-3к=п(с+3)-к(с+3)=(п-к)(с+3)
3) НОД=3
НОК=720
720+3=723
(х+1/2)(х+5/2) = x^2 + 33/4
x^2 + (6/2)x + 5/4 = x^2 + 33/4
3x = 28/4
x = 7/3
ПРОВЕРКА: 7/3 + 1/2 = (14+3)/6 = 17/6
7/3 + 5/2 = (14+15)/6 = 29/6
17/6 * (29/6) = 17*29/36 = 493/36
(7/3)^2 = 49/9
49/9 + 33/4 = (49*4+33*9)/36 = 493/36