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        1. }ĿijУ@FQُI\b(jng)˽҃ɼ\Ӯa(chn)Ʒ(jng)NͬӵărijNƷƵ꠷ͻ@֪ÿ꠷ÿ@Ԫ꠷c@M.(jng)ǢՄ׵ă(yu)ݷǣÿُIʮ꠷һ@ҵă(yu)ݷǣُI꠷^tُI@.

          1ÿ꠷ÿ@ărǶ

          2@FُI@Ǵ(sh)Ոúʽӷքeʾ׽(jng)Nҽ(jng)NُIbM

          3ڣ2ėl£ͨ^ӋДൽļҽ(jng)NُI

          𰸡1ÿ꠷ăr150Ԫÿ@ăr100Ԫ2ُ̈IMÞ飺100m+14000Ԫُ̈IMÞ飺80m+15000Ԫ3(dng)rҽ(jng)NُI.


          1O(sh)ÿl@ĶrxԪtÿ꠷ǣx+50Ԫ(j)꠷c@Mг̼ⷽ
          2(j)ס҃̈ă(yu)ݷ

          3քe루2õăɂʽɵóMMб^.

          1O(sh)ÿ@ărxԪtÿ꠷ăr飨x+50Ԫ
          (j)}ã2x+50=3x
          ãx=100
          x+50=150
          ÿ꠷ăr150Ԫÿ@ăr100Ԫ
          2ُ̈IMÞ飺150100+100m- =100m+14000Ԫ
          ُ̈IMÞ飺150100+0.8100m=80m+15000Ԫ
          ʴ𰸞飺100a+1400080a+15000

          3(dng)rُ̈IMÞ飺100m+14000=10060+14000=20000Ԫ

          ُ̈IMÞ飺80m+15000=8060+15000=19800Ԫ

          19800<20000,

          ஔ(dng)rҽ(jng)NُI.

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          P(gun)(x)}

          ĿД(sh)W(xu) Դ

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          (3)D4ڌ10 m,L40 mLβ˵һlС·,С·Ȟ1 m,@K˵صe.

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          ĿД(sh)W(xu) Դ

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          ĿД(sh)W(xu) Դ

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          1a=_____n=_____

          2aȫl(sh)ֱD

          3ԓУ2000W(xu)ɿ70£70֣ČW(xu)ȫRдMһӏȫtԓУȫRČW(xu)sж

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          ĿД(sh)W(xu) Դ

          }ĿD1һL4a2bL؈Dֳ̓4LȻ󰴈D2Πƴһ

          1D2Ӱֵ߅L úabʽӱʾ

          22a+b7ab3D2Ӱֵe

          3^D2õʽʾ2ab2ab2a+b2Ĕ(sh)P(gun)ϵ

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          ĿД(sh)W(xu) Դ

          }ĿڡABCBAC90ABACcDֱBCһccDcBCغADֱ߅AD҂(c)ֱADEҡDAE90BCE

          1D(dng)cDھBCϕr

          BCcCEλP(gun)ϵ

          BCCDCE֮gĔ(sh)P(gun)ϵ

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          3D(dng)cDھBCLϕrBCCDCE֮gĔ(sh)P(gun)ϵ

          鿴𰸺ͽ>>

          ĿД(sh)W(xu) Դ

          }Ŀ҇ʩġһһ·(zhn)Էݼ;КWҲУ҇ؑc_‡Ķ˹ȫ̼s11025ǧףͬӵ؛݆\ݔˮ··F··̵1.6ˮ·씵(sh)F·씵(sh)3܇ƽ٣ƽÿǧה(sh)݆ƽٵ249ǧףքe܇݆ƽ٣

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          ĿД(sh)W(xu) Դ

          }Ŀɽخa(chn)uNۺMrÿǧ40Ԫÿǧ60Ԫƽÿ۳100ǧˣ(jng)^Ј{(dio)l(f)F(xin)΃rÿ2ԪtƽÿNۿ20ǧԓuN@NҪƽÿ@2240ԪՈش

          1ÿǧ˺ґ(yng)rԪ

          2ƽÿ@׃rM׌AЈԓꑪ(yng)ԭۃrĎ۳ۣ

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          ĿД(sh)W(xu) Դ

          }ĿDABC Уc DE քe߅ ACAB BD c CE c Ool١EBODCOBECDOBOC

          (1)lăɂlжABC ǵ(̖г)

          (2)Ոx(1)еһNΣC^̣

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          ͬ(x)Դ