Вправи: 73

73. Спростіть вираз:

1) ax-1 + 51-x = ax-1 – 5x-1 = a-5x-1;

2) mc-3 – p3-c = mc-3 + pc-3 = m+pc-3;

3) 5xx-y + 5yy-x = 5xx-y – 5yx-y = 5(x-y)x-y = 5;

4) 10p2p-m + 5mm-2p = 10p2p-m – 5m2p-m = 10p-5m2p-m = 5(2p-m)2p-m = 5.