Вправи: 525

525. Спростіть вираз:

1) 98 – 50 + 32 = 49 •2 – 25 •2 + 16 •2 = 72 – 52 + 42 = 62;

2) 38 + 128 – 13162 = 4 •2+ 64 •2 – 13 81 •2 = 3 • 22 + 82 – 13 • 92 = 62 + 82 – 32= 112;

3) 0,7300 – 7349 + 23 108 = 0,73•100 – 73•149 + 23 36•3 = 0,7 • 103 – 7 • 17 3 + 23 • 63 = 73 – 3 + 43 = 103;

4) 5a – 220a + 380a = 5a – 24•5a + 316•5a= 5a – 2 • 25a + 3 • 45a = 5a – 45a + 125a = 95a;

5) a3b – 2a a5b = a2• ab – 2a a4• ab = аab – 2a • a²ab = аab – 2aab = –аab;

6) c5 + 4cc3 – 5с²c= c4• c + 4сc2•c – 5с²c = с²c + 4с²c – 5с²c = 0.