Выполните действия: а) 1 - 5/7
б) 3 7/9 - 2

в) 4/9 + 5/8

г) 8 5/12 - 6 7/20

д)3 1/2 : 1 3/4

е) 5/6•18/25

ж) 7/9 - 5/18 ​
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