Вправи: 74

74. Виконайте дію:

1) ca-2 + x2-a = ca-2 – xa-2 = c-xa-2;

2) ax-y – 8y-x = ax-y + 8x-y = a+8x-y;

3) 2mm-n + 2nn-m = 2mm-n – 2nm-n = 2(m-n)m-n = 2;

4) 16x4x-y + 4yy-4x = 16x4x-y – 4y4x-y = 16x-4y4x-y = 4(4x-y)4x-y = 4.