Упростите выражения:
а)2ab+4b/3a * 6a^2/a^2b-4b 
б)m^2-n^2/3mn : m^2+2mn+n^2/6m^2n^2
в)x^2-y^2/x^2 : (x+y)^2/x
Помогите пожалуйста)
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