Разложите многочлен на множители, используя метод выделения полного кводрата двучлена:
а)[tex] x^{2} [/tex]-10х+20
б)[tex] y^{2} [/tex]-14[tex] y^{2} [/tex]+40
в)[tex] b^{4} [/tex] +4[tex] b^{2} [/tex]-5
г)[tex] a^{2} [/tex]-6а+5
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