Условие:

Используя числа 10, 9, 1, знаки "+", "−" и скобки, составь различные выражения и найди их значения.

1 + 9 + 10 = 10 + 10 = 20
(1 + 9) + 10 = 10 + 10 = 20
1 + (9 + 10) = 1 + 19 = 20
1 + 9 − 10 = 10 − 10 = 0
(1 + 9) − 10 = 10 − 10 = 0
1 + 10 + 9 = 11 + 9 = 20
(1 + 10) + 9 = 11 + 9 = 20
1 + (10 + 9) = 1 + 19 = 20
1 + 10 − 9 = 11 − 9 = 2
(1 + 10) − 9 = 11 − 9 = 2
1 + (10 − 9) = 1 + 1 = 2
1 − (10 − 9) = 1 − 1 = 0
9 + (10 − 1) = 9 + 9 = 18
9 − (10 − 1) = 9 − 9 = 0
10 + 9 + 1 = 19 + 1 = 20
(10 + 9) + 1 = 19 + 1 = 20
10 + (9 + 1) = 10 + 10 = 20
10 − 9 + 1 = 1 + 1 = 2
10 + 9 − 1 = 19 − 1 = 18
(10 − 9) + 1 = 1 + 1 = 2
10 − (9 + 1) = 10 − 10 = 0
(10 + 9) − 1 = 19 − 1 = 18
10 + (9 − 1) = 10 + 8 = 18
10 − 9 − 1 = 1 − 1 = 0
9 + 1 + 10 = 10 + 10 = 20
(9 + 1) + 10 = 10 + 10 = 20
9 + (1 + 10) = 9 + 11 = 20
9 − 1 + 10 = 8 + 10 = 18
9 + 1 − 10 = 10 − 10 = 0
(9 − 1) + 10 = 8 + 10 = 18
(9 + 1) − 10 = 10 − 10 = 0
9 + 10 + 1 = 19 + 1 = 20
(9 + 10) + 1 = 19 + 1 = 20
9 + (10 + 1) = 9 + 11 = 20
9 + 10 − 1 = 19 − 1 = 18
(9 + 10) − 1 = 19 − 1 = 18
(10 − 9) − 1 = 1 − 1 = 0
10 − (9 − 1) = 10 − 8 = 2
10 + 1 + 9 = 11 + 9 = 20
(10 + 1) + 9 = 11 + 9 = 20
10 + (1 + 9) = 10 + 10 = 20
10 − 1 + 9 = 9 + 9 = 18
10 + 1 − 9 = 11 − 9 = 2
(10 − 1) + 9 = 9 + 9 = 18
10 − (1 + 9) = 10 − 10 = 0
(10 + 1) − 9 = 11 − 9 = 2
10 − 1 − 9 = 9 − 9 = 0
(10 − 1) − 9 = 9 − 9 = 0