Ответ:
х : 1 5/7 = 2 2/5 : 2 2/35
х : 12/7 = 12/5 : 72/35
[x]/[12/7]=[12/5]/[72/35]
[7x]/[12]=7/6
42x=84;x=84:42;x=2
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Ответ:
х : 1 5/7 = 2 2/5 : 2 2/35
х : 12/7 = 12/5 : 72/35
[x]/[12/7]=[12/5]/[72/35]
[7x]/[12]=7/6
42x=84;x=84:42;x=2