Вправи: 65

65. Подайте у вигляді дробу:

1) 7a4x – 3a4x = 4a4x = ax;

2) x+y8 – x-3y8 = x+y-(x-3y)8 = x+y-x+3y8 = 4y8 = y2;

3) a+49 + 5-a9 = a+4+5-a9 = 99 = 1;

4) x+3y10 + 4x+7y10 = x+3y+4x+7y10 = 5x+10y10 = 5(x+2y)10 = x+2y2;

5) 5m-28m – m-108m = 5m-2-(m-10)8m = 5m-2-m+108m = 4m+88m = 4(m+2)8m = m+22m;

6) 7a+136a + 17-a6a = 7a+13+17-a6a = 6a+306a = 6(a+5)6a = a+5a.