Ответ:
12/15=3х/45
12•45=3х•15
540=45х
х=540/45
х=12
3•12=36
12/15= 36/45
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Ответ:
12/15=3х/45
12•45=3х•15
540=45х
х=540/45
х=12
3•12=36
12/15= 36/45