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        1. 2013•όώُ(gu)I(mi)bW(xu)һͯ(ji)(dng)(hu)(chng)ķN(li)ЦĘ͐(i)ăɷNɷNăr(ji)ͬͬһNăr(ji)ͬڕ(hu)(chng)Ҫُ(gu)I(mi)r(sh)һ4(g)򣩞λ֪һăr(ji)Dʾtăr(ji)飨
          Ҫăr(ji)ЦĘκ͐(i)εĚĆ΃r(ji)ͿY(ji)Փ
          ⣺O(sh)ЦĘεĚxԪһ(g)(i)εĚyԪһ(g)}⣬
          3x+y=14
          x+3y=18
          
          ã2x+2y=16
          xC
          c(din)u(png)}ˌW(xu)^R(sh)DжԪһη̽M⌍(sh)H(wn)}\(yn)ú͔(sh)W(xu)w˼\(yn)}r(sh)(j)΃r(ji)(sh)=r(ji)Ĕ(sh)P(gun)ϵP(gun)I
          (x)(c)ϵд
          P(gun)(x)}

          ͬ(x)(c)