Упростите: (7а-б) - (3а-2б) + 2(б-4а)
Решите: 28/40 : 84/140  

-1 7/8 * (12,2 - 10 2/3) : 1/4 + 16  

(2 1/6 - 3 3/8) * 24 + 1 1/8 : (-3 3/4)             

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