67 + 18 + 3 + 2; 24 + 65 + 5 + 6; 90 − 6; 96 − 10; 53 − (20 + 7); 53 − 20 + 7.

2 классМатематика

67 + 18 + 3 + 2;
24 + 65 + 5 + 6;
906;
9610;
53 − (20 + 7);
5320 + 7.

StaticConfig

67 + 18 + 3 + 2; 24 + 65 + 5 + 6; 90 − 6; 96 − 10; 53 − (20 + 7); 53 − 20 + 7.

Решение

67 + 18 + 3 + 2 = (67 + 3) + (18 + 2) = 70 + 20 = 90;
24 + 65 + 5 + 6 = (24 + 6) + (65 + 5) = 30 + 70 = 100;
906 = 84;
9610 = 86;
53 − (20 + 7) = 53207 = 337 = 26;
5320 + 7 = 33 + 7 = 40.