Ответ: 1) 3/m+5/n
n*3/nm+5/n
n*3/nm+m*5/mn
3n/nm+m*5/mn
3n/mn+5m/mn
3n+5m/mn
2) 4/x-3/xy
y*4/ yx-3/xy
4y/yx-3/xy
4y-3/xy
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Ответ: 1) 3/m+5/n
n*3/nm+5/n
n*3/nm+m*5/mn
3n/nm+m*5/mn
3n/mn+5m/mn
3n+5m/mn
2) 4/x-3/xy
y*4/ yx-3/xy
4y/yx-3/xy
4y-3/xy