преобразуйте в многочлен: а) (4x^2 + x) * 4x-4x^2 - 7
б) 2m^2 - m (2m-5n) - n * (2m-n); в) 6x^2 - 5x*(-x+2y)+4x*(2.5y-3x); г) 2m^2(-3n^2)+5n^2m-6mn^2+6m^2n^2
б) 2m^2 - m (2m-5n) - n * (2m-n); в) 6x^2 - 5x*(-x+2y)+4x*(2.5y-3x); г) 2m^2(-3n^2)+5n^2m-6mn^2+6m^2n^2
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b) =2m² -2m² +5mn -2mn + n² =3mn +n²
в) 6x² +5x² -10xy +10xy - 12x² = -x²
г) -6m²n² +5n²m -6mn² + 6m²n² = -mn²