1) 2:4, 6:10. 10:12,10:18,20:6,- 2:18

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вопрос

The given expressions can be interpreted as a series of ratios.

1) 2:4 can be simplified to 1:2, which means the ratio of 2 to 4 is equivalent to the ratio of 1 to 2.
2) 6:10 simplifies to 3:5.
3) 10:12 simplifies to 5:6.
4) 10:18 simplifies to 5:9.
5) 20:6 simplifies to 10:3.

Therefore, the series of ratios is:
1:2, 3:5, 5:6, 5:9, 10:3

And the final expression, -2:18 simplifies to -1:9.