Помогите пожалуйста
1) (1 -1/а)^2:a-1/3a^2
2) (1+y/x):(y/x -1)
3) a/1-b-a^2+ab/b^2-1•b+1/a+b
4) a/a-3:a^2+2a/a^2-9-a/a+2
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