1) Найдите значение раскрывая скобки 
34,4-(18,1-5,6)+(-11,9+8)
2) Упростите 
а) 4m-6m-3m+7+m
б) -8* (x-3)+4*(x-2)-2*(3x+1)
В) 2/7-(14a-3 1/2b)- 1,2 (5/6a-0,5b)

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