Вправи: 68

68. Подайте у вигляді дробу:

1) 3a-bab – 5b+3aab = 3a-b-(5b+3a)ab = 3a-b-5b-3aab = –6bab = –6a;

2) 9m+2k25k – 9m-3k25k = 9m+2k2 - (9m-3k2)5k = 9m+2k2- 9m+3k25k = 5k25k = k;

3) 5b- m24m3 – m2+ 5b4m3 = 5b- m2- (m2+ 5b)4m3 = 5b- m2- m2- 5b4m3 = -2m24m3 = –12m;

4) 4a-36a + a+86a – 5-a6a = 4a-3+a+ 8-(5-a)6a = 5a+5-5+a6a = 6a6a = 1.