已知二元一次方程组3nyx0 ymx的解是2y1 x,则m+2n的值为 ( )A.1 B.2 C.3 D.0新建广场比旧广场面积增加120%,若新
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![已知二元一次方程组3nyx0 ymx的解是2y1 x,则m+2n的值为 ( )A.1 B.2 C.3 D.0新建广场比旧广场面积增加120%,若新](/uploads/image/z/1544892-60-2.jpg?t=%E5%B7%B2%E7%9F%A5%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%26%2357519%3B%26%2357518%3B%26%2357517%3B%26%2357376%3B%26%2357358%3B%26%2357376%3B%26%2357358%3B3nyx0+ymx%E7%9A%84%E8%A7%A3%E6%98%AF%26%2357519%3B%26%2357518%3B%26%2357517%3B%26%2357360%3B%26%2357376%3B%26%2357376%3B2y1+x%2C%E5%88%99m%2B2n%E7%9A%84%E5%80%BC%E4%B8%BA+%EF%BC%88+%EF%BC%89A%EF%BC%8E1+B%EF%BC%8E2+C%EF%BC%8E3+D%EF%BC%8E0%E6%96%B0%E5%BB%BA%E5%B9%BF%E5%9C%BA%E6%AF%94%E6%97%A7%E5%B9%BF%E5%9C%BA%E9%9D%A2%E7%A7%AF%E5%A2%9E%E5%8A%A0120%25%2C%E8%8B%A5%E6%96%B0)
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