№ 1
а). а = 3 * 5³ * 7
b = 2 * 3² * 5² * 7
НОК (а,b) = 2 * 3² * 5³ * 7 =2 * 9 * 125 * 7 =
=15750
б) а=720
b=108
а=2³ * 2 *3² * 5
b=2² * 3³
НОК (а,b)=2³ * 3³ * 5=8*27*5=1080
№ 2
5/2 : (1 - 3/18)-3 =
=5/2 : 1 - 3 = 5/2 : 25/18 - 3 = 5/2 * 18/25 - 3 x] = =[tex] \frac{5*18}{2*25} " alt=" \frac{3}{10} [/tex] = =[tex] \frac{5*18}{2*25} " align="absmiddle" class="latex-formula"> - 3 = 1/45 - 3 =
=2/90 - 3 =
= - 3 =
= - 3
№ 3
5,6 - 4,6 + 5,6 + 1,2 + 3,4 = 1 + 5,6 + 4,6 =
= 11,2