2) 21/50 * у = 1; 4) 29/38 * у = 1

Question

2) 21/50 * у = 1; 4) 29/38 * у = 1

Answer 1

21/50*у=1
0,42*у=1
у=2,38095238
21/50*2,38095238=1
29/38*у=1
0,76315789*у=1
у=1,31034484
29/38*1,31034484=1

Comments

21/50*у=1

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у=1:21/50

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у=50/21

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21/50*50/21=1

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29/38*у=1

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у=1:29*38

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у=38/29

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29/38*38/29=1

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так вы пишите?

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да