Вправи: 72

72. Спростіть вираз:

1) 497-m – m27-m = 49- m27-m = 7-m(7+m)7-m = 7 + m;

2) x+7x2- 1 – 6x2- 1 = x+7-6x2- 1 = x+1x-1(x+1) = 1x-1;

3) 5x-2x2- y2 – 5y-2x2- y2 = 5x-2-(5y-2)x2- y2 = 5x-2-5y+2x2- y2 = 5x-5yx2- y2 = 5(x-y)x-y(x+y) = 5x+y;

4) 3a-4b(a-b)2 + 2a-b(a-b)2 = 3a-4b+2a-b(a-b)2 = 5a-5b(a-b)2 = 5(a-b)(a-b)2 = 5a-b.