<em>-3*(4-2х)+7*(х-2)=-12+6х+7х-14=</em><em>13х-26</em>
(-3). (x-y)= -3.x +(-3).(-y)=-3x+3y
(2/3 + 7/12) = (8/12 + 7/12) = 15/12
16/25 * 15/12 = 4/5 * 3/3 = 4/5
9/10:15/16 = 9/10 * 16/15 = 144/150 = 72/75
4/5 - 72/75 = 60/75 - 72/75 = -12/75
-12/75 = -4/25 = -0.16
Наименьшее общее кратное-НОК.
НОК (840,280,360)=2520
НОК (108,35)=3780
НОК (216,35)=7560