90 баллов!!!!!!!!!Выполните действия:
1) (x/2 - x/3) * 5/x^2
2) y^2/4 * (y/5 - 2/y^2)
3) (1/x + 1/y) : 2/xy
4) 12x/x - y * (x/6 + y/6)
1) (x/2 - x/3) * 5/x^2
2) y^2/4 * (y/5 - 2/y^2)
3) (1/x + 1/y) : 2/xy
4) 12x/x - y * (x/6 + y/6)
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