\( 78 \times 8 = (70 + 8) \times 8 = 70 \times 8 + 8 \times 8 = 560 + 64 = 624 \)
\( 59 \times 4 = (60 - 1) \times 4 = 60 \times 4 - 1 \times 4 = 240 - 4 = 236 \)
\( 624 - 236 = 388 \)
Ответ: 388