2) Вычислить:
2.1) 3/4 + 2/4 - 1 = ?
2.2) 7/12 - 5/12 + 3/12 = ?

3) Вычислить:
3.1) 3/4 + 3/5 = ?
3.2) 2 - 3/7 = ?

4) Вычислить:
4.1) 4/9*3/5 = ?
4.2) 3/20*5/9 = ? CРОЧНО ДАЮ 10 БАЛЛОВ ПЖЖЖ
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