1)запишите формулы 1) a+(-b+ c - d)= 2) a-(b - c + d)= 3) a x (b + c - d)=


2)Упрастите выражения 1) 0,5а х 3b x ( -4c)= 2) 2.6-(-k + 1)= 3) 1.3 - 2 + 4.6a= 4) 6x-3(x-7)= 5) (3x+y) - (-x-4y)=


3) Найдите значение вырожения 1) 1/5 (15x - 20y) - 0.5 (8x + 2y)=
при x = 1 y = 1
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