2x-{7y+[4x-7y-2(x-3x-2y)]-3x}其中x=1/2,y=-1先化简在求值.算的过程中很容易出错,希望细心一点呀!
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![2x-{7y+[4x-7y-2(x-3x-2y)]-3x}其中x=1/2,y=-1先化简在求值.算的过程中很容易出错,希望细心一点呀!](/uploads/image/z/1746619-43-9.jpg?t=2x-%7B7y%2B%EF%BC%BB4x-7y-2%EF%BC%88x-3x-2y%EF%BC%89%EF%BC%BD-3x%7D%E5%85%B6%E4%B8%ADx%3D1%2F2%2Cy%3D-1%E5%85%88%E5%8C%96%E7%AE%80%E5%9C%A8%E6%B1%82%E5%80%BC.%E7%AE%97%E7%9A%84%E8%BF%87%E7%A8%8B%E4%B8%AD%E5%BE%88%E5%AE%B9%E6%98%93%E5%87%BA%E9%94%99%2C%E5%B8%8C%E6%9C%9B%E7%BB%86%E5%BF%83%E4%B8%80%E7%82%B9%E5%91%80%21)
2x-{7y+[4x-7y-2(x-3x-2y)]-3x}其中x=1/2,y=-1先化简在求值.算的过程中很容易出错,希望细心一点呀!
2x-{7y+[4x-7y-2(x-3x-2y)]-3x}其中x=1/2,y=-1先化简在求值.算的过程中很容易出错,希望细心一点呀!
2x-{7y+[4x-7y-2(x-3x-2y)]-3x}其中x=1/2,y=-1先化简在求值.算的过程中很容易出错,希望细心一点呀!
2x-{7y+[4x-7y-2(x-3x-2y)]-3x}
=2x-7y-[4x-7y-2(x-3x-2y)]+3x
=5x-7y-[4x-7y-2(x-3x-2y)]
=5x-7y-4x+7y+2(x-3x-2y)
=x+2(-2x-2y)
=x-4x-4y
=-3x-4y
=-3/2+4
=5/2
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