1) 15/17 = 30/34 2) 8/30 = 0,4/1,5 3) 0,9/7,1 = 9/71 4) 0,6/1,3 = 3,6/7,8

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вопрос

There seems to be a mistake in each of the equations provided. Let's correct them:

1) 15/17 is not equal to 30/34
2) 8/30 is not equal to 0.4/1.5
3) 0.9/7.1 is not equal to 9/71
4) 0.6/1.3 is not equal to 3.6/7.8

Please let me know if you would like assistance with solving any specific equations.