Упростите выражения :
1) 3mn/2m^8 : m^2n-4n/4m^4;
2) x^2-9/x^2+4x+4 : x-3/x+2;
3) a^3/a^3+8 · (a+2/a)^3
4) 4m^2-n^2/3mn^3 · (2m^2n/2m-n)
5) x-2y/4x-9y^2 : x^2-4xy+4y^2/2x+3y
1) 3mn/2m^8 : m^2n-4n/4m^4;
2) x^2-9/x^2+4x+4 : x-3/x+2;
3) a^3/a^3+8 · (a+2/a)^3
4) 4m^2-n^2/3mn^3 · (2m^2n/2m-n)
5) x-2y/4x-9y^2 : x^2-4xy+4y^2/2x+3y
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