помогите!!
Сократите дроби:
a)13m^3y^4z^5(c-d)/26xy^5z^7(d-c)
б)4a^2-9b^2/2a-3b 
в)40c^2-10d^2/20c^2+20cd+5d^2
г)y^6+y^3/y^6-1
/-дробная черта
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