287-x+124=149
287-x=149-124
287-x=25
x=287-25
x=262
2.7+3x=9(x-2.1)
2.7+3x=9x-18.9
-6x=21.6
x=21.6/(-6)
x=-3.6
81 = 3*3*3*3;
108 = 3*3*3*2*2;
НОД (81;108) = 3*3*3 = 27.
а) 32 = 2*2*2*2*2;
48 = 2*2*2*2*3;
НОК (32;48) = 2*2*2*2*2*3 = 96;
б) 50 = 2*5*5;
297 = 3*3*3*11;
НОК (50;297) = 2*5*5*3*3*3*11 = 14850;