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Мася203
@Мася203
July 2022
2
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решите пропорцию 2.5/7х:2.8/9=4.2/13:1.9/19
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Roofle
Точно не уверен, но должно быть так
30 votes
Thanks 33
mari1925
2.5/7x :2,8/9=4,2/13:1,9/19
19/7х: 26/9=54/13: 28/19
19/7х * 28/19=54/13 * 26/9
4х=12
х=3
32 votes
Thanks 44
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19/7х: 26/9=54/13: 28/19
19/7х * 28/19=54/13 * 26/9
4х=12
х=3