3m+mk-3n-kn=m(3+k)-n(3+k)=(3+k)(m-n)
447,593+619,549+517,366+142,89=1727,398
9х+10-14х=-8х-5
9х-14х+8х=-5-10
3х=-15
х=-3
1) -6у2 Вариант1
2)-10х+18
3)-64а2
4)2аb3-9
5)-х2у2
6)b
4y^3-12y^2+(3-y)(3-y)=4y^3-12y^2+(9-3y-3y+y^2)=4y^3-12y^2+9-3y+y^2=4y^3-11y^2+9+3y=(y-3)(y+1)(4y-3)