разложите на множители:
а) r^3s^4+r^4s^3=
б) 20a^3x-15a^4x^2=
в)x^2-9=
г) 1-25y^2=
д) 3x-2x^2+3y-2xy=
е)20z^2k+2z-5k+1=
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