帮我出一些这样的题型的题吗?如{6(x-y)-7(x+y)=21,2(x-y)-5(x+y)=-1 (这是二元一次方程组) 20道就成了
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![帮我出一些这样的题型的题吗?如{6(x-y)-7(x+y)=21,2(x-y)-5(x+y)=-1 (这是二元一次方程组) 20道就成了](/uploads/image/z/11463385-49-5.jpg?t=%E5%B8%AE%E6%88%91%E5%87%BA%E4%B8%80%E4%BA%9B%E8%BF%99%E6%A0%B7%E7%9A%84%E9%A2%98%E5%9E%8B%E7%9A%84%E9%A2%98%E5%90%97%3F%E5%A6%82%7B6%28x-y%29-7%28x%2By%29%3D21%2C2%28x-y%29-5%28x%2By%29%3D-1+%EF%BC%88%E8%BF%99%E6%98%AF%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BC%89+20%E9%81%93%E5%B0%B1%E6%88%90%E4%BA%86)
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