因式分解填空题
问题描述:
因式分解填空题
①3a^2b-3ab+6a=( )(a^2-a+2) ②若m、n互为相反数,则5m+5n-5= ③因式分解:3a+12a^2+12a^3= ④已知x+y=6,xy=-3,则x^2y+xy^2=
答
①3a^2b-3ab+6ab=(3b )(a^2-a+2)
②若m、n互为相反数,则5m+5n-5= -5
③因式分3a+12a^2+12a^3= 3a(2a+1)^2
④已知x+y=6,xy=-3,则x^2y+xy^2=xy(x+y)=-18