（急用）初二几道数学分解因式题：x^2-5x+m有一个因式是x-6，则m=____.

(1)x^2-5x+m有一个因式是x-6，则m=_-6___.
(x-6)(x+1)=x^2-5x-6
m=-6

(2)a^2-4a+4,2a^2-8和2a-4的公因式是_a-2___.
a^2-4a+4=(a-2)^2
2a^-8=2(a-2)(a+2)
2a-4=2(a-2)

(3)若3a-b=2,则9a^2-6ab+b^2=__4__.
9a^2-6ab+b^2=(3a-b)^2=4

(4)已知x+y=0.2,x+3y=1,则3x^2+12xy+9y^2的值是_0.6___.
3x^2+12xy+9y^2=3(x+y)(x+3y)=0.6

(5)如果x^3-6x^2+11x-6=(x-1)(x^2+ax+b)则a=_-5___,b=_6___.
=x^3+ax^2+bx-x^2-ax-b
(a-1)=-6
a=-5
-b=-6
b=6

(1)x^2-5x+m有一个因式是x-6，则m=__-6__.

(2)a^2-4a+4,2a^2-8和2a-4的公因式是__2(a-2)^2(a+2)__.

(3)若3a-b=2,则9a^2-6ab+b^2=__4__.

(4)已知x+y=0.2,x+3y=1,则3x^2+12xy+9y^2的值是_0___.

(5)如果x^3-6x^2+11x-6=(x-1)(x^2+ax+b)则a=__-5__,b=__6__.

6*6-5*6+m=0
m=-6