5/9+1 5/7•(4 2/3-2 5/8): 1 3/4
2-3 1/7•(2-1 9/11):8/21
2 1/3+1 1/10: (2 7/15-5/12)•5/6
4 5/12-1 1/2:(2 1/6+8/15)•1 4/5
помогите
2-3 1/7•(2-1 9/11):8/21
2 1/3+1 1/10: (2 7/15-5/12)•5/6
4 5/12-1 1/2:(2 1/6+8/15)•1 4/5
помогите
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