若把分式2/x^3-x,1/x^2-2x+1通分,则它们的最简公分母是A.x(x-1)² B.x(x-1)^3C.x(x-1)²(x+1) D.x(x-1)²(x+1)²
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![若把分式2/x^3-x,1/x^2-2x+1通分,则它们的最简公分母是A.x(x-1)² B.x(x-1)^3C.x(x-1)²(x+1) D.x(x-1)²(x+1)²](/uploads/image/z/12686500-28-0.jpg?t=%E8%8B%A5%E6%8A%8A%E5%88%86%E5%BC%8F2%2Fx%5E3-x%2C1%2Fx%5E2-2x%2B1%E9%80%9A%E5%88%86%2C%E5%88%99%E5%AE%83%E4%BB%AC%E7%9A%84%E6%9C%80%E7%AE%80%E5%85%AC%E5%88%86%E6%AF%8D%E6%98%AFA.x%EF%BC%88x-1%EF%BC%89%26%23178%3B+B.x%EF%BC%88x-1%EF%BC%89%5E3C.x%EF%BC%88x-1%EF%BC%89%26%23178%3B%EF%BC%88x%2B1%EF%BC%89+D.x%EF%BC%88x-1%EF%BC%89%26%23178%3B%EF%BC%88x%2B1%EF%BC%89%26%23178%3B)
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若把分式2/x^3-x,1/x^2-2x+1通分,则它们的最简公分母是A.x(x-1)² B.x(x-1)^3C.x(x-1)²(x+1) D.x(x-1)²(x+1)²
若把分式2/x^3-x,1/x^2-2x+1通分,则它们的最简公分母是
A.x(x-1)² B.x(x-1)^3
C.x(x-1)²(x+1) D.x(x-1)²(x+1)²
若把分式2/x^3-x,1/x^2-2x+1通分,则它们的最简公分母是A.x(x-1)² B.x(x-1)^3C.x(x-1)²(x+1) D.x(x-1)²(x+1)²
2/(^3-x)=2/x(x^2-1)=2/x(x+1)(x-1)
1/(x^2-2x+1)=1/(x-1)^2
所以:要把这两个分式通分,要取两个分式分母的最简公分母:x(x+1)(x-1)^2
C.x(x-1)²(x+1)
看不太清楚是不是 (2/x) - 1=2/x +(x/x=(2+x)/x (1-3x)/2 - 2x=(1-3x)/2 -4x/2=(1-7x)/2 请楼主再把题目说清楚些