一道简单的算术题不知道怎么算的【30x+20(30-x)】÷30=28.5解得x=25.5这个是怎么算的?我自己是这样算的,麻烦看一下问题出在了哪里{30x+60-20x}÷30=28.5x+2-2/3x=28.51/3x=28.5-21/3x=26.5x=26.5÷1/3=26.5×3=7
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![一道简单的算术题不知道怎么算的【30x+20(30-x)】÷30=28.5解得x=25.5这个是怎么算的?我自己是这样算的,麻烦看一下问题出在了哪里{30x+60-20x}÷30=28.5x+2-2/3x=28.51/3x=28.5-21/3x=26.5x=26.5÷1/3=26.5×3=7](/uploads/image/z/3745943-71-3.jpg?t=%E4%B8%80%E9%81%93%E7%AE%80%E5%8D%95%E7%9A%84%E7%AE%97%E6%9C%AF%E9%A2%98%E4%B8%8D%E7%9F%A5%E9%81%93%E6%80%8E%E4%B9%88%E7%AE%97%E7%9A%84%E3%80%9030x%2B20%EF%BC%8830-x%EF%BC%89%E3%80%91%C3%B730%3D28.5%E8%A7%A3%E5%BE%97x%3D25.5%E8%BF%99%E4%B8%AA%E6%98%AF%E6%80%8E%E4%B9%88%E7%AE%97%E7%9A%84%3F%E6%88%91%E8%87%AA%E5%B7%B1%E6%98%AF%E8%BF%99%E6%A0%B7%E7%AE%97%E7%9A%84%2C%E9%BA%BB%E7%83%A6%E7%9C%8B%E4%B8%80%E4%B8%8B%E9%97%AE%E9%A2%98%E5%87%BA%E5%9C%A8%E4%BA%86%E5%93%AA%E9%87%8C%EF%BD%9B30x%2B60-20x%EF%BD%9D%C3%B730%3D28.5x%2B2-2%2F3x%3D28.51%2F3x%3D28.5-21%2F3x%3D26.5x%3D26.5%C3%B71%2F3%3D26.5%C3%973%3D7)
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