Преобразуйте в многочлен:
а) (4х2+х)*4х-4х2-7
б) 2m2-m(2m-5n)-n(2m-n)
в) 6х2-5х(-х+2у)+4х(2,5у-3х)
г) 2m2*(-3n2)+5n2*m-6mn2 + 6m2*n2

a) 16x^2+4x^2-4x^2-7=16x^3-7б)2m^2-2m^2-5nm-2mn-n^2=-5nm-2mn-n^2в)6x^2+5x^2-10xy+10xy-12x^2=-1x^2г)-6m^2n^2+5n^2m-6mn^2+6m^2n^2=5n^2m-6mn^2