化简:(3c-y)^2-(2c+y)^2-5c(c-y)标题和这一条化简(解释):[(2C-2分之3×y-(C-y)]^2-2分之3×Cy
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![化简:(3c-y)^2-(2c+y)^2-5c(c-y)标题和这一条化简(解释):[(2C-2分之3×y-(C-y)]^2-2分之3×Cy](/uploads/image/z/10919102-14-2.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A%283c-y%29%5E2%EF%BC%8D%282c%2By%29%5E2%EF%BC%8D5c%28c-y%29%E6%A0%87%E9%A2%98%E5%92%8C%E8%BF%99%E4%B8%80%E6%9D%A1%E5%8C%96%E7%AE%80%EF%BC%88%E8%A7%A3%E9%87%8A%EF%BC%89%EF%BC%9A%5B%282C-2%E5%88%86%E4%B9%8B3%C3%97y-%28C-y%29%5D%5E2%EF%BC%8D2%E5%88%86%E4%B9%8B3%C3%97Cy)
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化简:(3c-y)^2-(2c+y)^2-5c(c-y)标题和这一条化简(解释):[(2C-2分之3×y-(C-y)]^2-2分之3×Cy
化简:(3c-y)^2-(2c+y)^2-5c(c-y)
标题和这一条化简(解释):[(2C-2分之3×y-(C-y)]^2-2分之3×Cy
化简:(3c-y)^2-(2c+y)^2-5c(c-y)标题和这一条化简(解释):[(2C-2分之3×y-(C-y)]^2-2分之3×Cy
(3c-y)^2-(2c+y)^2-5c(c-y)=(9c^2-6cy+y^2)-(4c^2+4cy+y^2)-5c^2+5cy
=9c^2-6cy+y^2-4c^2-4cy-y^2-5c^2+5cy
=-5cy
[(2C-2分之3×y-(C-y)]^2-2分之3×Cy = (2c-3/2y-c+y)^2-3/2cy
=(c-1/2y)^2-3/2cy
=c^2-cy+1/4y^2-3/2cy
=c^2-5/2cy+1/4y^2
化简:(3c-y)^2-(2c+y)^2-5c(c-y)标题和这一条化简(解释):[(2C-2分之3×y-(C-y)]^2-2分之3×Cy
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