2. Вычислите сумму, выбрав удобный порядок действий: 221+427+373; 16+32+24+28; 107+132+93+268; 635+308+365+392; 138+172+37+263; 19+56+11; 456+22+78; 134+408+166; 42+495+58; 43+96+57; 353+22+7; 765+208+135; 144+99+56; 4999+423+1.

Question

Вопрос:

Accepted Answer

221 + 427 + 373 = 221 + 373 + 427 = 594 + 427 = 1021.
16 + 32 + 24 + 28 = (16 + 24) + (32 + 28) = 40 + 60 = 100.
107 + 132 + 93 + 268 = (107 + 93) + (132 + 268) = 200 + 400 = 600.
635 + 308 + 365 + 392 = (635 + 365) + (308 + 392) = 1000 + 700 = 1700.
138 + 172 + 37 + 263 = (138 + 263) + (172 + 37) = 401 + 209 = 610.
19 + 56 + 11 = (19 + 11) + 56 = 30 + 56 = 86.
456 + 22 + 78 = 456 + (22 + 78) = 556.
134 + 408 + 166 = (134 + 166) + 408 = 300 + 408 = 708.
42 + 495 + 58 = (42 + 58) + 495 = 595.
43 + 96 + 57 = (43 + 57) + 96 = 196.
353 + 22 + 7 = 353 + (22 + 7) = 382.
765 + 208 + 135 = (765 + 135) + 208 = 900 + 208 = 1108.
144 + 99 + 56 = (144 + 56) + 99 = 299.
4999 + 423 + 1 = (4999 + 1) + 423 = 5423.

Ответ: