Докажите, что многочлен не принимает отрицательных значений:
a) m^2-2mn+n^2+p^2
б) 2a^2+b^2-2b+1
в) 9x^2+y^2-6x+1
г) x^2-2xy+2y^2-2y+1
д ) 1-4ab+a^2b^2+a^2+b^2
f) m^2+n^2+6m-4n+13
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