a) x + 50/150 = 80/150 + 70/150;
x = 150/150 - 50/150;
x = 100/150 = 2/3;
б) 2/18 + с = 1 - 12/18;
c = 6/18 - 2/18;
c = 4/18 = 2/9;
в) 1 - а = 130/300 + 90/300;
a = 1 - 220/300;
a = 80/300 = 4/15;
г ) k/100 = 3/3;
k/100 = 1;
k = 1*100 = 100;
a) x + 50/150 = 80/150 + 70/150;
x = 150/150 - 50/150;
x = 100/150 = 2/3;
б) 2/18 + с = 1 - 12/18;
c = 6/18 - 2/18;
c = 4/18 = 2/9;
в) 1 - а = 130/300 + 90/300;
a = 1 - 220/300;
a = 80/300 = 4/15;
г ) k/100 = 3/3;
k/100 = 1;
k = 1*100 = 100;