\[\boxed{\text{253\ (253).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ (940 + 50)\ :10 - 86 \cdot 0 =\]
\[= 990\ :10 - 0 = 99\]
\[\ (600675 - 675)\ :1000\ :10 =\]
\[= 600\ 000\ :1000\ :10 =\]
\[= 600\ :10 = 60\]
\[\ 8 \cdot 79 + 21 \cdot 8 = 8 \cdot (79 + 21) =\]
\[= 8 \cdot 100 = 800\]
\[5 \cdot 193 - 93 \cdot 5 =\]
\[= 5 \cdot (193 - 93) = 5 \cdot 100 =\]
\[= 500\]
\[2)\ 14\ 800\ :100 + 300 =\]
\[= 148 + 300 = 448\]
\[(705487 - 5487)\ :1000 \cdot 10 =\]
\[= 700\ 000\ :1000\ \cdot 10 =\]
\[= 700 \cdot 10 = 7000\]
\[(563 + 213)\ :8 = 776\ :8 =\]
\[= (720 + 56)\ :8 = 90 + 7 = 97\]
\[\ 614 + 774\ :9 =\]
\[= 614 + (720 + 54)\ :9 =\]
\[= 614 + 80 + 6 = 700\]