变态的因式分解!I need you

来源：学生作业帮编辑：大师作文网作业帮分类：数学作业时间：2024/11/18 10:05:31

变态的因式分解!I need you

2、
∵a+1/b=1；b+2/c=1
∴a=1-1/b=(b-1)/b；c=2/(1-b)
∴c+2/a
=2/(1-b)+2/[(b-1)/b]
=2/(1-b)-2b/(1-b)
=(2-2b)/(1-b)
=2(1-b)/(1-b)
=2
3、x²+x-3=0
x²+x=3
∴(3-x²-x³)/(x-1)
=[3-x(x+²)]/(x-1)
=(3-3x)/(x-1)
=-3(x-1)/(x-1)
=-3

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