1.[(x+2y)²-(x-2y)²-(x+2y)(x-2y)-4y²]÷2x,其中x=-2,y=二分之一2.(x+3)(2x-5)-(2x+1)(x-8)=413.已知3的m次方×9的m次方×27的m次方×81的m次方=3的30次方,求m的值过程详细点 回答好就采纳
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![1.[(x+2y)²-(x-2y)²-(x+2y)(x-2y)-4y²]÷2x,其中x=-2,y=二分之一2.(x+3)(2x-5)-(2x+1)(x-8)=413.已知3的m次方×9的m次方×27的m次方×81的m次方=3的30次方,求m的值过程详细点 回答好就采纳](/uploads/image/z/976007-47-7.jpg?t=1.%5B%28x%2B2y%29%26%23178%3B-%28x-2y%29%26%23178%3B-%28x%2B2y%29%28x-2y%29-4y%26%23178%3B%5D%C3%B72x%2C%E5%85%B6%E4%B8%ADx%3D-2%2Cy%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%802.%EF%BC%88x%2B3%29%282x-5%29-%282x%2B1%29%28x-8%29%3D413.%E5%B7%B2%E7%9F%A53%E7%9A%84m%E6%AC%A1%E6%96%B9%C3%979%E7%9A%84m%E6%AC%A1%E6%96%B9%C3%9727%E7%9A%84m%E6%AC%A1%E6%96%B9%C3%9781%E7%9A%84m%E6%AC%A1%E6%96%B9%3D3%E7%9A%8430%E6%AC%A1%E6%96%B9%2C%E6%B1%82m%E7%9A%84%E5%80%BC%E8%BF%87%E7%A8%8B%E8%AF%A6%E7%BB%86%E7%82%B9++%E5%9B%9E%E7%AD%94%E5%A5%BD%E5%B0%B1%E9%87%87%E7%BA%B3)
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