1.若x.y为任意有理数,化简|x-y|-|y-x|2.a与b互为相反数,c.d互为倒数,m的绝对值是2,求a+b\m+m的三次方-cd的值.
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![1.若x.y为任意有理数,化简|x-y|-|y-x|2.a与b互为相反数,c.d互为倒数,m的绝对值是2,求a+b\m+m的三次方-cd的值.](/uploads/image/z/6870812-68-2.jpg?t=1.%E8%8B%A5x.y%E4%B8%BA%E4%BB%BB%E6%84%8F%E6%9C%89%E7%90%86%E6%95%B0%2C%E5%8C%96%E7%AE%80%7Cx-y%7C-%7Cy-x%7C2.a%E4%B8%8Eb%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2Cc.d%E4%BA%92%E4%B8%BA%E5%80%92%E6%95%B0%2Cm%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%E6%98%AF2%2C%E6%B1%82a%2Bb%5Cm%2Bm%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9-cd%E7%9A%84%E5%80%BC.)
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