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        1. 2013•όώُIbW(xu)Уһͯ(ji)ӕķNЦĘ͐ăɷNɷNărͬͬһNărͬڕҪُIrһ4򣩞λ֪һărDʾtăr飨
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          ⣺O(sh)ЦĘεĚxԪһεĚyԪһ}
          3x+y=14
          x+3y=18
          
          ã2x+2y=16
          xC
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          P(gun)(x)}

          ͬ(x)Դ