Вправи: 181

181. Спростіть вираз:

1) ab+ b2m-3n : a2- b22m-6n = ba+b • 2(m-3n)m-3na-b(a+b) = 2ba-b;

2) x-5y2- 4 : 2x-103y-6 = x-5 • 3(y-2)y-2y+2 • 2(x-5) = 32y+2;

3) x2- 9x2+ x : x2+ 6x+97x+7 = x-3x+3 • 7(x+1)xx+1(x+3)2 = 7(x-3)x(x+3);

4) x-4ya2- 2ab+ b2 : 4xy- x2a-b = x-4y(a-b)(a-b)2 • (-xx-4y) = –1x(a-b) = 1x(b-a).