упростите выражение а) (25x^2+10x+1):5x+1/5x-1
б) x-2y/4x^2-9y^2:x^2-4xy+4y^2/2x+3y в)4m^2-n^2/2mn^3*(2m^2n/2m-n)^2

/- дробь
^-степень

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