Ответ:
1)455=7х
7х=455
х=65
2)3х/ 4/5=27/4
15х/4= 27/4
15х=27
х=9/5
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Ответ:
1)455=7х
7х=455
х=65
2)3х/ 4/5=27/4
15х/4= 27/4
15х=27
х=9/5