102. 407 + 109·5 903 – 206·4 (700 – 603)·6 (800 – 704)·7 804:4 627:3

Решение:

1. 407 + 109 × 5 $$ 407 + 109 \times 5 = 407 + 545 = 952 $$
2. 903 – 206 × 4 $$ 903 - 206 \times 4 = 903 - 824 = 79 $$
3. (700 – 603) × 6 $$ (700 - 603) \times 6 = 97 \times 6 = 582 $$
4. (800 – 704) × 7 $$ (800 - 704) \times 7 = 96 \times 7 = 672 $$
5. 804:4 $$ 804 : 4 = 201 $$
6. 627:3 $$ 627 : 3 = 209 $$