初中八年级分式多项式的通分.急.........
- 培训职业
- 2025-08-04 18:12:15
（1）解：最简公分母：x^2-y^2=(x+y)(x-y) (x+y）^2(x-y) 两个相乘 多一个（x+y）去掉
2xy/(x+y)^2=2xy*(x-y)/(x+y)^2*(x-y)=2xy(x-y)/(x+y)^2(x-y)
x/x^2-y^2=x*(x+y)/(x-y)(x+y)*(x+y)=x(x+y)/x+y)^2(x-y)
(2）解：最简公分母:(x-3)x (x^2-3x)=(x-3)x
9/x-3=9*x/(x-3)x=9x/(x-3)x=9/(x-3)
1/x^2-3x=1/(x-3)x
我也是八年级的，我们刚讲完，我都会，打字好累，LZ要采纳欧
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