<span>12,345•678,9-67,89•1,234=8297,24424
1) </span><span>12,345•678,9=8381,0205;
2) </span><span>67,89•1,234=83,77626;
3) </span>8381,0205-83,77626=8297,24424
12,345•678,9-67,89•1,234=
1) 12,345•678,9 = 8381,0205
2) 67,89•1,234= 83,77626
3)8381,0205-83,77626=8297,24424
Ответ: 8297,24424