а)3a+20xb-3b-20xa = 3(a-b)-20x(a-b)=(a-b)(3-20x)
б) x^2-y^2-5x-5y=(х-у)(х+у)-5(х+у)=(х+у)(x-y-5)
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а)3a+20xb-3b-20xa = 3(a-b)-20x(a-b)=(a-b)(3-20x)
б) x^2-y^2-5x-5y=(х-у)(х+у)-5(х+у)=(х+у)(x-y-5)