Условие:

1 * 2;
1 * 3;
1 * 4;
60 − (7370);
31 + (6860);
40 − (9 + 30);
8450;
8054;
804;
10 * 2;
10 * 3;
10 * 4.

1 * 2 = 2;
1 * 3 = 3;
1 * 4 = 4;
60 − (7370) = 603 = 57;
31 + (6860) = 31 + 8 = 39;
40 − (9 + 30) = 4039 = 1;
8450 = 34;
8054 = 26;
804 = 76;
10 * 2 = 20;
10 * 3 = 30;
10 * 4 = 40.