пожалуйста помогите срочно...
1) 2/3 от 48.



2) 2/5 от 400.



3) (6/25 - 1/5) * 5/6.



4)20:(7 - 31/4)*1 4/5 - 5 1/2.



5) 4 4/27 - x =1 8/9.

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