求几道数学题答案现在就要12分悬赏计算(1) (5a+4c+7b)+(5c-3b-6a)(2) (8xy-x^2+y^2)-(x^2-y^2+8xy)(3) (2x^2-1\2+3x)-4(x-x^2+1\2)(4) 3x^2-{7x-(4x-3)-2x^2}先化简下式,再求值(-x^2+5+4x)+(5x-4+2x^2) 其中x=-2
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![求几道数学题答案现在就要12分悬赏计算(1) (5a+4c+7b)+(5c-3b-6a)(2) (8xy-x^2+y^2)-(x^2-y^2+8xy)(3) (2x^2-1\2+3x)-4(x-x^2+1\2)(4) 3x^2-{7x-(4x-3)-2x^2}先化简下式,再求值(-x^2+5+4x)+(5x-4+2x^2) 其中x=-2](/uploads/image/z/6997221-45-1.jpg?t=%E6%B1%82%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98%E7%AD%94%E6%A1%88%E7%8E%B0%E5%9C%A8%E5%B0%B1%E8%A6%8112%E5%88%86%E6%82%AC%E8%B5%8F%E8%AE%A1%E7%AE%97%281%29+%285a%2B4c%2B7b%29%2B%285c-3b-6a%29%282%29+%288xy-x%5E2%2By%5E2%29-%28x%5E2-y%5E2%2B8xy%29%283%29+%282x%5E2-1%5C2%2B3x%29-4%28x-x%5E2%2B1%5C2%29%284%29+3x%5E2-%7B7x-%284x-3%29-2x%5E2%7D%E5%85%88%E5%8C%96%E7%AE%80%E4%B8%8B%E5%BC%8F%2C%E5%86%8D%E6%B1%82%E5%80%BC%28-x%5E2%2B5%2B4x%29%2B%285x-4%2B2x%5E2%29+%E5%85%B6%E4%B8%ADx%3D-2)
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