有点多,、1.若(x+m)与(x+1/2)的积中不含x项,则m是多少?2.(x+y) ( )=x^2-y^2(2x^2-y^2) ( )=4x^4-y^43.用平方差公式计算:202*198 二十又四分之一 *(负十九又3/4)(-x-2y)(x-2y)
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![有点多,、1.若(x+m)与(x+1/2)的积中不含x项,则m是多少?2.(x+y) ( )=x^2-y^2(2x^2-y^2) ( )=4x^4-y^43.用平方差公式计算:202*198 二十又四分之一 *(负十九又3/4)(-x-2y)(x-2y)](/uploads/image/z/10215596-20-6.jpg?t=%E6%9C%89%E7%82%B9%E5%A4%9A%2C%E3%80%811.%E8%8B%A5%EF%BC%88x%2Bm%29%E4%B8%8E%28x%2B1%2F2%29%E7%9A%84%E7%A7%AF%E4%B8%AD%E4%B8%8D%E5%90%ABx%E9%A1%B9%2C%E5%88%99m%E6%98%AF%E5%A4%9A%E5%B0%91%3F2.%28x%2By%29+%28+%29%3Dx%5E2-y%5E2%282x%5E2-y%5E2%29+%28+%29%3D4x%5E4-y%5E43.%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%9A202%2A198+%E4%BA%8C%E5%8D%81%E5%8F%88%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80+%2A%EF%BC%88%E8%B4%9F%E5%8D%81%E4%B9%9D%E5%8F%883%2F4%EF%BC%89%28-x-2y%29%28x-2y%29)
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