Найдите значение выражения (устно) :
1) 2/7+1/7
2) 9/14-5/14
3) 5/6-1/6
4) 5/9+2/9
5) 13/20+11/20
6) 17/32-15/32
7) 41/100-33/100
8) 8/99+2/99
ЭТО 5 КЛАСС
задание 500 на странице 172
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