Прошу, помогите! Выполните действие:
А) 1/4+1/5=
Б) 1/3+1/7=
В) 3/5+3/4=
Г) 1/2+7/9=
Д) 5/7+0=
Е) 2/3-2/5
Ж) 1/2-1/3=
З) 3/5-4/7=
И) 5/7-1/6=
К) 8/9-0=
Л) 3/4+4/5=
М) 3/4+2/9=
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