15+3=18 15+5=20 15+10=25 15+30=45
9+9=18 6+9=15 3+9=12 0+9=9
300 = 2² * 3 * 5²
750 = 2 * 3 * 5³
НОД (300, 750) = 2 * 3 * 5² = 150
×*700-460=289000
×* 700=289000+460
×* 700=289460
×=413/18/35
Теорема косинусов:
a² = b²+c²- 2bc*cosα
cosα = (b²+c²-a²)/2bc = (11²+8²-5²)/2*11*8 = (121+64-25)/176 = 160/176 = 0,9(09)
cosα = 0,9(09)