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Ответ дан
prettypushkova

1) 26 : 5,2 и 39 : 7,8

5 = 5 - верно

2) 7,5 : 2,5 и 2,5 : 1,5

3 ≠ 1,(6)

3) 10,5 : 3 и 31,5 : 9

3,5 = 3,5 - верно

4) 1 : 2 и 1,6 : 3,5

0,5 ≠ 0,4571...

Ответ: А) 1 и 3.

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