Ответ:
- ( 6,79 - 6 4/9 ) - ( 0,21 - 2 5/9 ) = - ( 679/100 - 58/9 ) - ( 21/100 - 23/9 ) = - 311/900 + 2111/900 = 1800/900 = 2 .
Ответ : 2.
Или так :
==== -6,79 + 6 4/9 - 0,21 + 2 5/9 = - 6,79-0,21 + 23/9 + 58/9 = - 7 + (23+58)/9= -7 + 81/9 = -7+9 = 2.
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Ответ:
- ( 6,79 - 6 4/9 ) - ( 0,21 - 2 5/9 ) = - ( 679/100 - 58/9 ) - ( 21/100 - 23/9 ) = - 311/900 + 2111/900 = 1800/900 = 2 .
Ответ : 2.
Или так :
==== -6,79 + 6 4/9 - 0,21 + 2 5/9 = - 6,79-0,21 + 23/9 + 58/9 = - 7 + (23+58)/9= -7 + 81/9 = -7+9 = 2.