выполни действия: а) 3 3/4+ 1 1/2 б) 2 5/6- 1 5/12 в) 4 - 1 2/3 г) 3 2/7-6/7 д) 1 1/3* 4 е) 3 1/4* 2/5 ж) 2 1/4: 3 з) 20: 2 1/2 помогите пожалуста!!!!
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