Вправи: 634

634. Виконайте дії:

1) (3-2a)\a2a – 1- a2\2a2 = a3-2a- 2(1- a2)2a2 = 3a+2a2- 2+2a22a2 = 3a-22a2;

2) a2- 6b23b + 2b^\3b = a2- 6b2+ 6b23b = a23b;

3) 4c2- 4c – x+4c2- 16 = 4\c+4c(c-4) – c+ 4\cc-4(c+4) = 4c+16- c2- 4ccc-4(c+4) = 16- c2-c4-c(c+4) = 4-c(4+c)-c4-c(c+4) = –1c;

4) 56a5b4 • b214b5 = 56a5 • b2b4 • 14b5 = 4a5b7;

5) 72a3bc : (27a²b) = 72a3 b • 1c • 27 • a2b = 8a3c;

6) 4a2- 1a2- 9 : 10a+5a+3 = 2a-12a+1 • (a+3)a-3a+3 • 5(2a+1) = 2a-15(a-3).