甲乙兩隊(duì)開(kāi)展足球?qū)官悾?guī)定每隊(duì)勝一場(chǎng)得3分,平一場(chǎng)得1分,負(fù)一場(chǎng)得0分,若甲隊(duì)勝場(chǎng)是平場(chǎng)的2倍,平場(chǎng)比負(fù)場(chǎng)多一場(chǎng),已知甲隊(duì)共積分21分,若設(shè)甲隊(duì)平場(chǎng)的場(chǎng)數(shù)為x,那么勝場(chǎng)的場(chǎng)數(shù)可表示為________;負(fù)場(chǎng)的場(chǎng)數(shù)可表示為________根據(jù)題意得方程為________

答案:
解析:

2x;x1;6xx21


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