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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