1) (5z^2-6k)^2-(5z^2 + 3k)^2 + 90k^2=27k^3
2) (m^2- n^2) (m^2 + n^2) - m^2(m^2- n^2)- m^2n^2 = -n^4
3) (1,2x^4 - 7y^2) (1,2x^4 + 7y^2) + 0,56x^8 + 49y^4 = 2x^8;
4)(1,4a^3 - 5b^2) (1,4a^3 + 5b^2) - 2,96a^6 + 25b^4 = -a^6.​

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