Вправи: 508

508. Спростіть вираз:

1) 82 – 32 = 82 – 16•2 = 82 – 42 = 42;

2) 63 – 27 = 63 – 9•3 = 63 – 33 = 33;

3) 96 – 36 = 16•6 – 36 = 46 – 36 = 6;

4) 2500 – 85 = 2100•5 – 85 = 2100•5 – 85 = 2 • 105 – 85 = 205 – 85 = 125;

5) 372 – 42 + 298 = 336•2 – 42 + 249•2 = 3 • 62 – 42 + 2 • 72 = 182 – 42 + 142 = 282;

6) 13 108 + 363 – 29 243 = 13 36•3 + 121•3 – 29 81•3 = 13 • 63 + 113 – 29 • 93 = 23 + 113 – 23 = 113.