因式分解.1.(x+4)-2(x+4)+1 2.ax+2ax+a 3.a-2ab+b-c 4.9-x+12xy-36y

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因式分解.1.(x+4)-2(x+4)+1 2.ax+2ax+a 3.a-2ab+b-c 4.9-x+12xy-36y

1.(x+4)-2(x+4)+1=(x+4-1)=(x+3).. 2.ax+2ax+a =a(x+2a+a)=a(x+a).. 3.a-2ab+b-c =(a-b)-c=(a-b+c)(a-b-c).. 4.9-x+12xy-36y=9-(x-12xy+36y)=9-(x-6y)=(3+x-6y)(3-x+6y) 追问:为什么题后...