3个回答
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(1-x/3-x)²÷(x²-6x+9/9-x²)²×1/(x-1)²
=(1-x)²/(3-x)²÷(x-3)²/(3+x)²(3-x)²×1/(x-1)²
=(1-x)²(3-x)²×(3-x)²×1/(x-1)²
=(1-x)²×1/(x-1)²
=(x-1)²×1/(x-1)²
=1
应该是对的吧?我在做任务,一定要采纳啊!!!
=(1-x)²/(3-x)²÷(x-3)²/(3+x)²(3-x)²×1/(x-1)²
=(1-x)²(3-x)²×(3-x)²×1/(x-1)²
=(1-x)²×1/(x-1)²
=(x-1)²×1/(x-1)²
=1
应该是对的吧?我在做任务,一定要采纳啊!!!
追问
(1-x/3-x)²÷(x²-6x+9/9-x²)²×1/(x-1)²
=(1-x)²/(3-x)²÷(x-3)²/(3+x)²(3-x)²×1/(x-1)²
=(1-x)²(3-x)²×(3-x)²×1/(x-1)²
=(1-x)²×1/(x-1)²
=(x-1)²×1/(x-1)²
=1
(3-x)²×(3-x)²如何消去的呢 ? 把这一步骤写下来吧:x²-6x+9/9-x²)²=( )
追答
刚刚写错了,忘了平方、、不好意思啊、、
(1-x/3-x)²÷(x²-6x+9/9-x²)²×1/(x-1)²
=(1-x)²/(3-x)²÷(x-3)的四次方/(3+x)²(3-x)²×1/(x-1)²
=(1-x)²×(3+x)²/(x-3)的四次方×1/(x-1)²
=(3+x)²/(x-3)的四次方
(x²-6x+9/9-x²)²
=【(x-3)²(完全平方公式)】²/【(3+x)(3-x)(平方差公式)】²
=(x-3)的四次方/(3+x)²(3-x)²(次数为偶次的相反数不用变号直接变减数位置)
呵,好乱啊、、郁闷死我了、、我算了三遍的、、
展开全部
.(1-x/3-x)²÷(x²-6x+9/9-x²)².1/(x-1)²
=(1-x)²/(3-x)²÷(x-3)²/(3-x)² .1/(x-1)²
=(1-x)²/(3-x)²÷1.1/(x-1)²
=(1-x)²/(3-x)².1/(x-1)²
=1/(3-x)²
=(1-x)²/(3-x)²÷(x-3)²/(3-x)² .1/(x-1)²
=(1-x)²/(3-x)²÷1.1/(x-1)²
=(1-x)²/(3-x)².1/(x-1)²
=1/(3-x)²
追问
(x²-6x+9/9-x²)²
=(x-3)²/(3-x)² 为什么,
一个是完全平方一个是平方差啊,
追答
(3+x)²/(3-x)^4
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展开全部
你的题目出的也太乱七八糟了。麻烦先把题目整好。(括号,乘除号等要标明白了,建议乘号用*号)
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