5.162 Выполните действия: a) 485 979 + 691.308; б) 409 . 539 - 179 888; в) 15³ - 3³ · 5; г) (10³ - 6³): (2⁴ · 7²).

а) 485 979 + 691 308

  485979
+691308
-------
1177287

б) 409 539 - 179 888

  409539
-179888
-------
  229651

в) 15³ - 3³ ⋅ 5 = 15 ⋅ 15 ⋅ 15 - 3 ⋅ 3 ⋅ 3 ⋅ 5 = 3375 - 27 ⋅ 5 = 3375 - 135 = 3240

 3375
- 135
----
 3240

г) (10³ - 6³): (2⁴ ⋅ 7²) = (10 ⋅ 10 ⋅ 10 - 6 ⋅ 6 ⋅ 6) : (2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 7 ⋅ 7) = (1000 - 216) : (16 ⋅ 49) = 784 : 784 = 1

 1000
- 216
----
  784

   16
 x 49
----
  144
+64
----
 784

Ответ: а) 1 177 287; б) 229 651; в) 3240; г) 1.