Номер 328
выполните действие и упростите результат ( N 328-329 )
a) 1/8 + 1/8 в) 2/9 + 1/9 д) 7/15 - 4/15

Номер 329
а) 5/9 +x =8/9 г) x- 7/20 =3/20
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