Знайди значення виразу:
| 1) 1 |
2 |
+ (–1 |
7 |
) + |
5 |
+ (–2 |
7 |
) = (1 |
2 |
+ |
5 |
) + (–1 |
7 |
+ –2 |
7 |
) = (1 |
4 |
+ |
5 |
) + (–1 |
21 |
+ 2 |
14 |
) = 2 |
1 |
+ (–3 |
35 |
) = 2 |
1 |
+ (–4 |
11 |
) = (3 |
35 |
– 2 |
1 |
) = –(3 |
35 |
– 2 |
2 |
) = –1 |
23 |
; |
| 3 |
8 |
6 |
12 |
3 |
6 |
8 |
12 |
6 |
6 |
24 |
24 |
2 |
24 |
2 |
24 |
24 |
2 |
24 |
24 |
24 |
| 2) 1 |
1 |
+ (–17 |
2 |
) + 12 |
3 |
= 1 |
1 |
+ 12 |
3 |
+ (–17 |
2 |
) = (1 |
2 |
+ 12 |
3 |
) + (–17 |
2 |
) = –(17 |
2 |
– 14 |
1 |
) = –(17 |
8 |
– 14 |
5 |
) = –3 |
3 |
; |
| 2 |
5 |
4 |
2 |
4 |
5 |
4 |
4 |
5 |
5 |
4 |
20 |
20 |
20 |
| 3) –3 |
3 |
+ 7 |
9 |
+ (–4 |
5 |
) = (–3 |
3 |
+ (–4 |
5 |
)) + 7 |
9 |
= –(3 |
9 |
+ 4 |
5 |
) + 7 |
9 |
= –7 |
14 |
+ 7 |
9 |
= –7 |
2 |
+ 7 |
9 |
= –2 |
8 |
+ 2 |
7 |
= – |
1 |
; |
| 7 |
14 |
21 |
7 |
21 |
14 |
21 |
21 |
14 |
21 |
14 |
3 |
14 |
42 |
42 |
42 |
| 4) –1,3 + (–1 | 7 | ) + 3 | 2 | = –1,3 + (–1,7) + 3 | 2 | = –3 + 3 | 2 | = | 2 | ; |
| 10 | 3 | 3 | 3 | 3 |
5) –2,5 + 1 5/6 + (–2 1/6) + (–3,7) = –2,5 + (–3,7) + (1 5/6 + (–2 1/6)) = –6,2 + (–(2 1/6 – 1 5/6)) = –6,2 + (– 1/3) = –6 1/5 + (–1/3) = –6 8/15
6) 5,2 + (–4 7/16) + 5 3/80 + (–4,7) = (5 1/5 + 5 3/80) + (–4 7/16 + (–4 7/10)) = 5 16/80 + 5 3/80+ (–(4 35/80 + 4 56/80) = 10 19/80 + (–8 91/80) = 10 19/80 + (–9 11/80) = 1 8/80 = 1 1/10